It will alarm when the glass shaken or broken; 

Send wireless signal to the alarm host; 
Sensitivity is adjustable (High, middle,low).

Technical parameters:

Power supplied 12V (inside battery12V)
Transmission frequency: 315/433/868MHz±0.5 MHz
Sending distance: No obstacle 80m
static current: ≤10uA                                                                            

Work condition: temperature -10~40 c
Humidity ≤90%