It has worked great and keeps me safe. I was always forgetting to close the garage door.
Bought so that it would light up when the garage door is open. Works as great.
This is a garage door position detector. It attaches to your garage door and when the garage door is raised it flips the detector sideways closing a circuit and transmitting a signal to a beeper inside the house which beeps until the door is lowered.That's it. There is no email or text message. There is no wifi or other network required. The position sensor sticks to the door with a sticky pad and the batteries for it are included. The beeper plugs into a wall socket inside the house. The beeping can be heard distinctly even in another room with the door closed.
I have had this system for 2 garage doors for sometime now and it has saved me from leaving door open a number of times.