With dual network of GSM + telephone cable more secure and reliable alarm system; With the quad-band GSM module for global use; Includes 2 wired zones and 99 wireless zones; LCD screen with a built-in clock; With voice prompts for easy operation; Supports an external intercom speaker; Supports 3 groups of timed arming and 3 groups of timed disarming; The main device can dial alarm calls to 6 preset phone numbers and send text alarm to 3 preset phone numbers; With 10 seconds manual recording function to leave messages; With a built-in digital voice device to give voice alarm automatically; With built-in SMS service to send alarm messages automatically; With wireless self-learning code pairing new accessories can be installed conveniently safely and effectively; Off-site remote control allows main device alarming dis-alarming monitoring and intercom etc.; Input voltage: DC 12V 1.5A; Standby current: <55mA; Alarm current: <450mA; Wireless frequency: 433MHz