... , Security alarm system, Home security alarm, Wireless GSM alarm, GSM wireless alarm, Home burglar alarm system,Feature:1. ... customized staying defence zone2. 8 remote-control switches wireless port, you can use SMS to control the ... Switch on/off3. wireless frequency 315MHZ/433MHZ ,arm ,disarm, SOS alarm bu ... you not only can listen in the local, but also can talk with the people.