Orr Aguirre

A 125+ dB sound when someone opens a door is indeed useful. However, you need protection from thieves who just break your window and crawls through which it. Therefore, you need either glass breakage sensor and/or a shock sensor. It detects rate of recurrence at which glass arrives. Then

For the main kind, with regard to a fob with a keychain, works together a small radio transmitter. When you press the relevant button while on the fob, seat instead of out a coded signal to the receiver which either in the car possibly in the garage and this triggers