IEMI's one product for the front door and garage: the garage door opener itself, made smart, so it closes a door left open, refuses an unsafe close and watches the garage, in one home app
Software: $2 per month (family alerts and the door log)
Concept, not for sale yet. Tell us if you want it; that decides what we build.
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How it fits together
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01
The whole GarageOne
The garage door opener is the garage's own watcher: a camera in its door end, a heat camera in its back end and a mic and temperature sensor inside the head feed one brain that closes a door left open after the legal warning, refuses an unsafe close and tells the family.
02Brain
Raspberry Pi Zero 2 W (in the opener head)
The brain: it runs the garageone-fw program
03
Door camera
Looks from the head's door end at the door, the doorway, both bays and the driveway when open: door state, a clear doorway before a close, cars, people, parcels
Raspberry Pi Zero 2 W (in the opener head) · CSI-2 ribbon to the brain · Video, 2 frames a second analysed, never stored
04
Heat camera
Looks from the back end at the water heater and the back of the bay: a wet pan, a dripping relief pipe, someone at the back in the dark
Raspberry Pi Zero 2 W (in the opener head) · I²C · 32 x 24 heat picture, 2 times a second
05
Mic and garage temperature
Hears the home's smoke and CO alarm patterns and an engine left running; reads the garage temperature for freezing
Raspberry Pi Zero 2 W (in the opener head) · Mic through an MCP3008 ADC on SPI; SHT45 on I²C · Sound pattern scores on the device (no audio leaves it); temperature every minute
06
Opener link
Reads the opener's own door position and asks for a move through its wall-button input; the opener's UL 325 board, eyes and reversal stay in charge
Raspberry Pi Zero 2 W (in the opener head) · Optocoupled wall-button input and the opener board's door-position output (GPIO) · Door open, closed or moving; move requests
07
Call lights and tone
Shows each call on the head and gives the 5 s flashing light and sound UL 325 needs before and during every remote close
Raspberry Pi Zero 2 W (in the opener head) · One data wire + PWM pin · Light colour and tone
08
Secure element, tamper switch and power
Signs each call and door move; marks the log if the cover is opened; 5 V from the opener's mains with a backup cell
Raspberry Pi Zero 2 W (in the opener head) · I²C + GPIO; 5 V · Signatures, tamper flag, power
09
All connected
7 key parts, one program, and your phone
Our circuit board · rev A-0
Every chip on one board we design, shaped to fit: the processor, cameras and sensors, Wi-Fi and Bluetooth, lights, sound and power. No plugs, ribbons or adapters. It is checked in our CAD against every part around it, and it arrives from the maker ready to run our software from a microSD card. Turn the model, or pick a part below to see where it sits.
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Every board-level number GarageOne's jobs depend on, checked against its target: camera pixels and frame rate, power and battery life, heat where it works, shock, radio and software. Every lesson from every one of our boards is a rule here, so this review runs again whenever any board teaches us something. Boards are ordered only when nothing fails and the items to prove are measured.
| Area | Check | Our board | Target | Status |
|---|---|---|---|---|
| Camera | Door camera: a parcel (0.3 m) on the driveway 3 m past the open door at 6.68 m | 96.9 px | ≥ 20 px | passes |
| Camera | Door camera: frame rate the calls need | 5 fps at 3840 × 2160 | chip: 30 fps at 3840 × 2160 | passes |
| Camera | Door camera: data rate vs its 4-lane link | 0.41 Gbps (10-bit) | ≤ 80 % of 3.564 Gbps | passes |
| Camera | Door camera: a small child (0.25 m wide) at the far end of the doorway at 4.67 m | 115.4 px | ≥ 20 px | passes |
| Camera | Door camera: frame rate the calls need | 5 fps at 3840 × 2160 | chip: 30 fps at 3840 × 2160 | passes |
| Camera | Door camera: data rate vs its 4-lane link | 0.41 Gbps (10-bit) | ≤ 80 % of 3.564 Gbps | passes |
| Camera | Heat camera: water in the heater's drain pan (0.3 m patch) at 2.97 m | 1.7 px | ≥ 1 px | passes |
| Camera | Image processor load, all cameras | 83 Mpx/s | ≤ 360 Mpx/s (RV1126B ISP) | passes |
| Camera | AI engine time per frame | 3 TOPS | the doorway check within 1 s of a close being asked for; car, person and parcel checks at 2 frames a second | to prove on the dev kit |
| Power | Supply | Mean Well IRM-10-5 PCB-mount 5 V 10 W supply (class II, listed) on the opener's own mains, on the power board | ≤ 70 % of the supply (7 W) | passes |
| Power | Power cut | one soldered 18650 cell (Samsung INR18650-35E) on the power board: in a power cut the camera drops to 1 frame a second and the heat chip to one frame a minute, about 1.0 W, about 7 h on an aged, cold cell (est.) | the "power cut" alert, the door state and the alarm listener for 4 h | to prove on the dev kit |
| Heat | RV1126B temperature, a summer garage (45 °C air at the ceiling) with the head closed | 68 °C | ≤ 85 °C (rated) | passes |
| Heat | Camera chip away from the processor | door camera 147 mm | ≥ 30 mm | passes |
| Heat | Temperature chip away from the supply | SHT45 222 mm from the IRM-10-5, on an island cut free by a slot | ≥ 150 mm, and reads within 1 °C of the garage | to prove on the dev kit |
| Shock | Shock and vibration | 20 g (est.) | standard parts | passes |
| Software | Starts our software from the microSD card, no setup | microSD socket with a hinged, latched lid (Amphenol 101-00660 class), fitted on every board: our software starts from the card | card socket fitted on every board, latched | passes |
| Software | Card power switch and protection | 1 power switch and 1 ESD array for 1 card socket | every socket: switched card supply, ESD on all 6 lines | fixed by the review |
| Software | The card wins the start | eMMC shipped empty; our loader reads the card first | the processor starts from the card every time | fixed by the review |
| Software | Card grade | industrial pSLC microSD (Kingston Industrial or Swissbit S-56u), −40 to 85 °C | rated for the heat, cold and writes | to prove on the dev kit |
| Software | Clip buffer for an unsure call | 19.8 s of 8-bit 5 fps video in 40 % of the 2 GB memory | ≥ 3 s | passes |
| Radio | Wi-Fi/BT module clock | 37.4 MHz MEMS oscillator (Y3) | 37.4 MHz next to the AP6256 | fixed by the review |
| Radio | Home Wi-Fi and BLE from inside the opener head | AP6256 with a chip antenna at the main board's top left corner, behind the ABS door-end wall | the home Wi-Fi at the far end of a two-car garage, BLE pairing at the wall control | to prove on the dev kit |
| Moisture | Conformal coating | coated | coated, sensors, sockets and antennas masked | passes |
| Fit | Board inside the product CAD, every part checked in 3D | not yet in the product CAD | nothing touches | to prove on the dev kit |
| Camera | Every garage call in view | Door camera: worst 44.1° / 20.7°; Heat camera: worst 29.2° / 11.3° | inside each sensor's view | passes |
| Camera | Door camera and heat camera windows | door 30 × 30 (margin 4.1 mm, steepest line of sight 57°); heat 30 × 30 (margin 5.7 mm, steepest 60°) | each view inside its window | passes |
| Fit | Sensor tabs on their brackets | Door camera: 0.3 mm inside the wall, hinge 11.8 mm; Heat camera: 0.3 mm inside the wall, hinge 8.4 mm | chip or holder ≥ 0.3 mm inside the wall, hinge within the 40 mm flex | to prove on the dev kit |
| Fit | Lights, tone and vents at their openings | 8 LEDs on each light strip inside the 60 × 14 side slot; the piezo over the tone holes; the SHT45 and the mic port behind the two rows of back-end vents | each at its opening | fixed by the review |
| Safety | The opener stays in charge of the door | one photo-MOS relay across the opener's wall-button pair (a momentary press), the door-position output through an optocoupler, the backup battery through a divider; nothing else wired to the opener | GarageOne never drives the motor; the opener's UL 325 board, reversal and eyes decide every move | passes |
| Safety | Mains kept on the power board | the opener's mains tap into a spring-clamp terminal, fuse, varistor, IRM-10-5 (class II); only 5 V, I²C and I²S on lead L1 | class II creepage on the power board; no mains on any other board | to prove on the dev kit |
| Security | Cover tamper sensor | TMAG5273 3D Hall chip at the right strip's top edge, 11.8 mm from a Ø8 × 3 magnet in a boss under the cover | cover off = logged and signed | to prove on the dev kit |
| Fit | Leads | L1 about 0.6 m along the right side wall through the bay-wall notches (0.038 V drop); L2 about 0.35 m to the opener's logic board | leads ≤ 0.15 V drop; clipped clear of the motor and gearbox | to prove on the dev kit |
Before we order the first boards, we prove these on the RV1126B development kit or in the rev A tests:
Demo · 6 real-world moments
Short animated scenes of real moments: what happens today, what GarageOne does about it, and what lands on your phone. The same scenes play in the IEMI app.
The family is away for the weekend and the garage is on its own.
Use cases
Away for the weekend, you wonder whether the garage door is shut, and nobody is there to check.
The opener makes the garage's calls itself: it closes a door left open only after the legal warning and a clear doorway, notes the cold, and messages only when a call needs someone. Unsure calls go to the app with a still and never move the door.
A garage door left open overnight is an open invitation, and the cold gets in; you notice it in the morning.
At the family's set time the door camera checks the doorway is clear, then the opener flashes and sounds for 5 seconds before and all through the close, as UL 325 and 16 CFR 1211 require. The opener's own photo eyes and reversal stay in charge.
Closing from an app, you cannot see the doorway; a bike or a bin under the door, or a child, is out of view.
Before any remote or timed close, the door camera checks the doorway band for a person, pet, bike, bin or car. If something is there, or it is under 90 % sure, the door does not move and the app says why. The photo eyes and reversal stay the safety system either way.
An engine running in a closed garage fills it, and often the house, with carbon monoxide, and nobody inside can see or smell it.
The mic knows an engine's sound and the door camera sees the car in the bay with the door shut. After 2 minutes the head turns red with a fast tone and every family phone gets the alert. It is not a CO alarm, but it also hears the home's own smoke and CO alarms. It never moves the door on this call.
A door left a little open on a winter night lets the pipes and the heater's lines freeze; a slow drip in the pan goes unseen for weeks.
The temperature sensor in the head reads the garage: below 3 °C and falling with the door open for 10 minutes, the head turns amber and offers the close. The heat camera at the back compares the heater pan with its usual heat picture and flags a wet patch or a dripping relief pipe.
With the family away, nobody knows who has been in the garage until something is missing.
A person seen by the door or heat camera while every family phone is away, with no remote or keypad opening the door, is called within 3 seconds: red lights, a tone and an alert with a still. A family member without their phone shows as unsure.
Demo scenes show how GarageOne and its app are designed to behave. GarageOne is in design; nothing here is recorded from real equipment yet.
What it is
IEMI's one product for the front door and garage: the garage door opener, made smart, with one brain and one app.
What it does
Who it's for
Families with an attached garage, and the installers who fit their openers.
The idea
The problem today
Garage doors left open overnight are a common way into a home, and police keep asking families to check them. Families add a smart garage hub, a garage camera, a leak puck and an alarm listener: four boxes and apps, and none of them knows whether the doorway is clear before a remote close.
With GarageOne
The opener already hangs from the ceiling and moves the door. GarageOne puts a camera in its door end, a heat camera in its back end and a mic and temperature sensor inside, so the opener closes a door left open after the legal warning, refuses a close with someone in the doorway, and calls an engine running, someone inside, a freezing garage, the home's alarm and a wet heater pan.
How the parts connect
Every part, what links it to the brain, and how the data reaches your phone. A solid line is a cable; a dashed line is a radio link.
The program
while True:
door = opener.position() # open, closed, moving
seen = detect(doorcam.frame()) # people, cars, objects
heat = mlx.frame()
calls = garage_step(door, seen, heat, mic.scores(), sht.temp(), family.away())
if close_wanted(door, calls) and doorway_clear(seen):
warn(lights=True, tone=True, s=5) # UL 325 unattended close
opener.press() # its eyes and reversal stay in charge
for c in calls:
if c.conf < c.line: c.kind = 'unsure' # never guess, never move the door
atecc.sign(c); light_and_tone(c); mqtt.publish(c)To your phone
Family phones (Android and iPhone); a read-only door log link for an insurer if the family shares it
One screen for each job GarageOne does.
No one home modeThe family is away for the weekend. The opener watches the garage alone, closes the door if it is left open, and messages only when a call needs someone.
Door left openIt is 22:30 and the big door has been open since the kids put their bikes away. The opener checks the doorway is clear, flashes and sounds for 5 s, and closes it.
Close refusedMum taps close from the car park at work, but a bike has fallen across the doorway. The opener refuses, turns amber and tells her why.
Engine, alarms and someone insideA teenager leaves the car running in the closed garage to warm it up. After 2 minutes the opener turns red with a fast tone and every family phone says so.
Freezing and the water heaterA cold night with the door left open a crack, and a slow drip from the heater's relief valve. The opener shows the falling temperature and the heat picture of the pan.
App screens with sample data. The interface is in development.
| Door | Closed at 22:30 after 5 s warning; doorway clear | Each move |
|---|---|---|
| Refused closes | Close refused at 18:12: bike in the doorway | Each call |
| Cars | Left bay: car home since 17:40; right bay empty | Each change |
| Garage | 2.4 °C and falling, door open 12 min | Every minute |
| Alarms | CO alarm pattern heard at 07:15 | Each call |
| Water heater | Pan cooler than usual on the left side: check for a leak | Each change |
Video stays in the opener head: only signed calls and stills or 10 s clips around calls leave it, kept 30 days; the driveway view is masked past the property line.
CAD design · Design rev A, stage 2 ready (28 Oct 2026): smart garage door opener that makes the garage's calls itself (8 calls, 6 alone, 2 assist), call lights and tone, ATECC608 and tamper switch inside; 12 sensor views checked in the CAD; not built
| AI processor | Boards of our own in the opener head: Rockchip RV1126B processor with 2 GB memory on the main board behind the door-end wall. The bench head uses a Raspberry Pi Zero 2 W until the boards arrive |
|---|---|
| Sensors | Sony IMX415 8 MP camera chip behind the door-end window, 25° down at the door, the doorway, both bays and the driveway (102° lens) · Melexis MLX90640 heat chip on the power board, 40° down through the back window at the water heater pan and the back of the bay · ICS-43434 digital mic and Sensirion SHT45 temperature chip behind the back-end vents · The opener's own door-position output and backup battery, read through an optocoupler and an ADC; 16 call-light LEDs, a piezo, a security chip and a cover tamper sensor |
| Connectivity | Wi-Fi (WPA3), MQTT over TLS · The opener's own rolling-code remotes |
| Power | From the opener's own mains through a class II Mean Well IRM-10-5 on its own power board; one soldered 18650 cell with a thermistor keeps the head watching and listening for about 7 h in a power cut (est.); about 2.4 W watching and up to 5.5 W at a close warning (est., board design review) |
| Enclosure | The opener's own moulded head; a magnet in the cover marks the log if it is taken off |
| Dimensions | Head 300 x 460 x 180 mm (est.); 3.1 m rail |
| Weight | About 0.2 kg more than the plain opener (est.) |
| Ingress rating | IP4X design target, not tested |
| Door | Closes a door left open after the warning |
|---|---|
| Doorway | Unsafe remote close refused |
| Cars | Car per bay; engine left running |
| Garage | Someone inside, freezing, alarms heard |
| Heater | Wet pan, dripping relief valve (assists) |
| Standard | UL 325 / 16 CFR 1211 (as amended 2024), opener's own eyes and reversal kept; battery backup for California |
|---|---|
| Remote close | 5 s light and sound warning |
| Head | 300 x 460 x 180, underside 2,220 mm |
| Not | A smoke or CO alarm or a security system |
Targets for production units; they may change during development.
Hardware: $499 per smart garage door opener
Software: $2 per month (family alerts and the door log)
Target pricing; fitting by the garage door installer extra, as for a plain opener. Bought separately, an opener with a camera in the head (Chamberlain B4643T, about $369 at Home Depot), our GarageHome hub ($189) and AlarmEcho ($39) add up to about $597, and the camera opener's video storage is $3.99-9.99 a month. Parts cost about $356 per opener at qty 1 including the drive (stage 2, prices checked 28 Oct 2026).
$499 + $2/month
Every garage job in the opener itself.
Indicative launch pricing in USD, excluding taxes and shipping. Final pricing is confirmed before any balance is charged.
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From the product lab · ideation phase
Smart equipment · legal on the field
It replaces the garage's existing opener (a smart belt-drive opener, about $250-330, est.); the opener's own motor, rail, UL 325 logic board, safety eyes, wall control and remotes are kept, with every part built in. Everything inside the opener head: brain, door camera, heat camera, mic, temperature sensor, call lights, tone, secure element, tamper switch, 5 V supply and a backup cell. Same head size, straps and rail; about +0.2 kg (est.); no ceiling camera box, ceiling hub, side-door station or heater probes.
| Rule | Limit | GarageOne |
|---|---|---|
| Primary and secondary entrapment protection | the opener reverses on contact and on a broken photo-eye beam; eyes no higher than 6 in (152 mm) above the floor | ✓ the opener's own UL 325 logic board, reversal and photo eyes at 150 mm are kept unchanged (asserted in the CAD); our brain can only ask for a move through the wall-button input, never bypass the eyes |
| Unattended operation (closing from the app or on a timer) | a flashing light and an audible warning before and during the close (UL 325 as adopted by 16 CFR 1211) | ✓ two NeoPixel call lights on the head flash and the piezo sounds for 5 s before and all through every remote or automatic close; the camera must also see the doorway clear |
| Same size and installation as the plain opener | head clear of the open door's travel; hung from the ceiling on the opener's own straps | ✓ 300 x 460 x 180 mm head, underside at 2,220 mm above a 2,134 mm door opening, on the same straps and rail (asserted in the CAD) |
| Mains safety inside the head | listed opener with mains only inside the head (UL 325, NEC) | ✓ a Mean Well IRM-10-5 (encapsulated, safety-approved module, 10 W) off the opener's own mains feed; only 5 V reaches the smart parts |
| California Health and Safety Code 19891-19892 (SB 969, 2018): residential garage door openers manufactured for sale, sold, offered for sale or installed in California from 1 July 2019 | a battery backup function that works the opener in an electrical outage; a replacement door may not be connected to an opener without it; $1,000 civil penalty per opener | ✓ the opener drive is bought with its own battery backup for the motor (bom.csv OPENER row), separate from our 18650 that keeps the calls running; from the 29 Oct check the head also reads that backup battery's voltage on a spare ADC channel and calls it worn or flat |
| 16 CFR 1211 as amended by the CPSC direct final rule of 14 March 2024 (in force 13 May 2024), adopting the UL 325 Seventh Edition revisions of 21 February 2023 | photo-eye height measured from the level surface below the door, no longer from the floor; 30,000-cycle endurance test with a 15 lbf force threshold, repeated normal-operation test after it | ✓ the opener's own eyes stay at 150 mm above the level surface under the door (asserted in the CAD) and the opener maker runs the revised endurance test with our parts inside; our own G-T4 cycle test raised from 10,000 to 30,000 cycles to match |
Home use. The opener stays a UL 325 / 16 CFR 1211 opener: the maker's certified logic board, reversal and photo eyes are unchanged and our parts only ask for a move. Not a smoke alarm, a CO alarm or a security system: it hears the home's own alarms and alerts. Radio certification and a UL 325 re-listing with the opener maker before sale.
One piece of equipment does
Not done by the equipment, and why
Makes the call itself
With no one home, the opener makes the garage's calls itself: it lights and sounds on the head first, closes a door left open only after the legal warning and a clear doorway, and tells the family's phones when a call stands. Calls it is unsure of go to the app as unsure, with a still, and never move the door.
| Call | Who decides | How it sees it | How players see the call · if unsure |
|---|---|---|---|
| Door left open: close itat the set time; 5 s warning before the door moves · door state about 99.9 % (from the opener's own travel sensor); clear doorway about 97 % (est., untested) | The equipment | the opener's own door position, door camera; door open past the family's set time at night or when every phone is away; doorway checked clear by an int8 person and object detector | Lights flash and the tone sounds for 5 s before and all through the close; app note after. Doorway not clear or the detector unsure: no close; the app asks the family |
| Remote close refused: something in the doorway< 1 s · about 97 % (est.) | The equipment | door camera; person, pet, bike, bin or car in the doorway band before any remote or timed close | Amber lights and two short tones; the app says why. Under 90 % confidence: it says unsure and does not close; the photo eyes and reversal stay the safety system either way |
| Car home or away; engine running with the door shut< 5 s for the car; 2 min for the engine · car about 99 % (est.); engine about 90 % (est.) | The equipment | door camera, mic; car present per bay from the camera; engine sound pattern on the mic with the door closed for 2 minutes | Red lights and a fast tone for the engine, then all phones; car state in the app only. Engine sound with no car seen: unsure, app note |
| Someone in the garage when the family is away< 3 s · about 95 % (est.) | The equipment | door camera, heat camera; a person detected while every family phone is away and no remote or keypad opened the door | Red lights and tone, then the family alert with a still. A family member without their phone: the app shows a still and asks |
| Freezing garage with the door open10 min · ±0.1 °C (SHT45 datasheet) | The equipment | SHT45, the opener's own door position; garage below 3 °C and falling with the door open for 10 minutes | Amber lights; app alert offering the close. Door closed: a note only |
| Smoke or CO alarm heard< 10 s · about 98 % on a garage or hall alarm within 8 m (est.) | The equipment | mic; the standard T3 smoke and T4 CO beep patterns (AlarmEcho's model), on the device | Red lights and an app and SMS alert; the door is never moved by this call. Pattern partly heard: unsure, app note |
| Water heater pan wet or relief valve dripping< 10 min · about 80 % (est., untested; a heat picture sees water only when it differs from the room) | Helps the official | heat camera; cool spread in the pan or a warm drip line on the relief pipe against the heater's learned heat picture | Amber lights, app note. App note with the heat picture; the family checks |
| Parcel or visitor at the open door< 3 s · about 90 % (est.) | Helps the official | door camera; person or box on the driveway or the threshold while the door is open | Soft chime and app note. Info to the app only |
| Opener backup battery worn or flatafter each door move; a summary once a month · flat battery about 95 %; worn about 80 % (est., until the G-T4 cycle test) | Helps the official | the opener's backup battery voltage through a divider on a spare MCP3008 channel, door position; voltage sag during each door move against the first month's moves, and the resting voltage after a night; worn below about 70 % of the first month's figure (est.) | Amber blink once after the move and an app note. App note asking the family to test the door with the power off; never moves the door |
Nothing added to the field
The only things in play are the items the laws already put there:
The door, the car, the water heater and the walls stay as they are; no ceiling camera box, hub, side-door station or heater probes
Built to take the hits
Secure by design
Openers with a camera in the head (Chamberlain B4643T about $369, the flagship B6753T about $740 in a June 2026 review) stream video and record clips on a $3.99-9.99 a month plan, but you have to look. GarageOne makes the calls itself: it checks the doorway before any remote or timed close, refuses an unsafe close, and calls an engine left running, someone inside, freezing, your alarms and a worn backup battery, at $2 a month.
Only if you turn on the close time, only with the doorway clear, and only after the 5 s flashing light and sound that UL 325 asks for. If it is unsure, it does not close and asks your phone. The opener's own safety eyes and reversal stay in charge.
$499 + $2 a month (target), about $100 less than a camera opener, our GarageHome hub and AlarmEcho bought separately. Your garage door installer fits it like any opener, with its own rail, safety eyes, wall control and remotes; fitting is extra, as for a plain opener.
GarageHome and GarageEye AI, whose pages now link here. Their door, car, person and heater jobs run inside the opener head. EdgeBell AI stays listed for the front-door doorbell, and AlarmEcho stays listed for alarms in other rooms.
Yes. The opener's own UL 325 board, reversal and safety eyes stay in charge, and every remote close gets the required flashing light and sound. Our brain only asks for a move. The opener maker re-lists it under UL 325 before sale.
No. It hears your alarms in or near the garage and alerts your phones. Keep your alarms.
Video stays in the opener head. Only signed calls and stills or 10 s clips around calls leave it, kept 30 days, and the driveway view is masked past your property line.
A backup cell keeps it watching and alerting for about 8 hours (est.); the motor runs on the opener's own backup battery, which California has required on every new opener since July 2019. GarageOne checks that battery after every door move and tells you when it is worn or flat, so the door still opens when you need to leave.
The federal opener rule, 16 CFR 1211, was updated in May 2024 to the 2023 UL 325 revisions (photo-eye height measured from the surface under the door, a tougher 30,000-cycle test). The opener's own eyes stay at 150 mm and the opener maker runs the new test with our parts inside. In California every new opener must have a battery backup (Health and Safety Code 19891); GarageOne's opener has one and checks it for you. There is still no US rule that switches off a keyless car left running, so the engine call stays.
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Concept · target $499