... 99 wireless defense zone for alarm system5, Industrial WAVECOME module, very stable6, Can call 5 phone numbers and send the SMS when ... (gap) sensors, gas sensors, smoke sensors, beams, panic buttons and so on11, Built in NI-HI battery, still work when ... alert, when power is on, will also alertTechnical parameter for the gsm alarm system wireless:Operating voltage: Input 100-250V, output 12V. Wireless ...