... 1800/1900MHz 4.48 wireless zone 5.Learning Code Security alarm, Security alarm system, Home security alarm, Wireless GSM alarm, GSM wireless alarm, Home burglar ... , you can use SMS to control the Switch on/off3. wireless frequency 315MHZ/433MHZ ,arm ,disarm, SOS alarm bu remote ... Using SMS or phone remote the system armed /disarmed, siren on/off, and control the wirelessswitches.10. In-build back up ...