Support gsm frequency 850/900/1800/1900 mhz, 315/433 mhz optional 4 wired guarding zones for connecting wired sensors, 1 x relay outputs, 40 wireless guarding zones; With usb interface Sms/mms 5 phones automatically while alarming Call 5 phones automatically while alarming and drive wiretap, can Clearly hear the voice on the scene Digital inputs are adopted opti cal-coupled isolators, which can prevent external high voltage from destroying internal. Arm/disarm and program the system by phone & sms Record function: maximum recording time:1 minute Tamper device: arming while the control panel removing or shaking With standby rechargeable battery. The host automatically stores System status, while its power is off