Features: 1) Without installation of wires and cables, DIY project 2) High sensitive and strong anti-interferential. Record message for ten seconds 3) 8 defense zones model, 8 LED matches 8 zones, LED will flash when alarm 4) Program six groups of telephone numbers 5) Auto-call stored telephone numbers circularly and simultaneously with alarm message when alarm is triggered 6) Can combine with wireless siren, be armed/disarmed with main panel synchronously 7) Mute alarm and audible alarm is at user\'\'s option 8) Separately arm/disarm for the certain defense zones 9) Self-alarm when telephone cable is disconnected or destroyed 10) Back-up rechargeable battery available for 36 hours when power is in failure 11) Remote operation to the main panel through the independent key-chain remote control 12) Urgent help function is available for 24 hours whenever in armed/disarmed condition 13) Add or reduce additional spare parts to the main panel is according to user\'\'s option 14) Widely used at home, shop, school, hospital, factory, warehouse, bank, government Specifications: 1) CE, CCC certified 2) Working frequency: 315MHz/433MHz 3) Power adaptor: a) Input AC110V, 220V, 230 - 240V b) Output DC 9V, 300mA 4) Stand-by current: 5) Alarm current: <150mA