... -Ion backup battery 3.7V 800mAH home security system with Lcd touch screen Feature:1. Touch keypad; ... attribute, name, bypass, alarm delay, intelligent door sensor function, beep indication could do free setting.5. ... set, 2 wireless remote control,1 pir sensor,1 door sensor, 1 adaptor,1 backup battery, 1 siren ... backup battery 3.7V 800mAH home security system with Lcd touch screen Li-Ion backup battery ...