The original roost battery built wi fi and a microphone into a 9 volt so it could know when your smoke detector sounded and send you an alert.
Garage door open alert light.
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Notifies you when a garage door is open with both audio and visual indicators supervised sensor monitors the sensors and their battery condition automatically main unit works with up to 16 sensors in 4 zones additional sensors sold separately comes with alert and alarm features with built in piercing 95db siren.
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This video describes how to set up a warning light inside your house to inform you that your garage door has been left open.
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If you do not see a solid illumination or your garage door is not working the problem is most likely due to the sensors being out of line.
When the door is closed the magnetic switch is closed and the relay is feeding terminal 87 a dead end and the light is off.
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The garage door sensor can also send you alerts.
You can also do this and reduce the amount of wire via x10.
Use a normally open magnetic alarm sensor difficult to find but out there and a x10 universal dry contact module in the garage and a x10 light module in the house.
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You can also power the led with a batteries but if the batteries run out and the garage door is open then there will be no power to light the led.
I used a cheap 3 volt wall tranformer from left over from another project.
For people who do not know the transmitter has the yellow light and the receiving sensor has the green light.
Now the door position is immediately apparent.
Find an outlet somewhere between the switch and the led where you can plug in a wall transformer to power the led.