We have a gate in front of the porch and I only open it when necessary. Thus, our garage doors are our main entrance and exit. Because of the obvious, I was hesitant to leave the garage door open without being there waiting for a guest. Yes, you can call me when you arrive, but it will be inconvenient. This alert solved the problem. The alarm is well made and can be powered by the supplied batteries or USB. USB does not charge batteries. No problem. I just ran an extension cord outside the garage and installed the transmitter between the doors. Everyone who enters the garage, car or person gives a nice red beep. I'm just having fun. There are 50 ringtone options. I connected the receiver to the other end of the house. About 45 feet and three walls from the transmitter. You can also deactivate the transmitter when it is not needed. I forgot to close my garage door when I got home and might be surprised but not with this product. It was ready to use immediately. I highly recommend it.
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