GSM+PSTN Network, PSTN is backup for GSM network; Words LCD display for easily operation; RFID function for house care or kids usage ,it’s convenient for them to disarm without knowing password; Two way communication with alarm host and alarm sensors, alarm host will check whether alarm sensors is in working status every 8 hours; When user arm the system, alarm host will check whether door/window are closed, if not closed, LCD display will remind user which door is open, and user can arm the system successfully until all doors/windows are closed；Doorbell feature；Alarm sensor low voltage SMS alert function; Extra SMS phone number for system's status；Alarm memo, entry delay, exit delay; Hybrid alarm, 30 wireless zones, 4 wired zones；Advanced zone attribute, user-friendly zone names; Relay output can be controlled by SMS or APP. This relay output used to control lights or some small home appliances; Support user code and administration code；100 alarm log；Reset factory design; Built-in speaker and Microphone；Remote two-way intercom；Built-in siren; SMS alert, when system: Arm/Disarmed, sensor's low battery, AC power failure, phone line disconnect；Alarm communication via ADEMCO Contact ID protocol; Backup rechargeable battery, last more than 8 hours; Work with CCTV system, IP camera.