... after the video image files are not lost.9. Optional additional 1600mA 3.7V Li-ion battery, power outage ... into Green light, press the switch of the battery cover, the light turned into Red light. Take ... for PIR, backup li-ion battery pack built-in.Product list:1, infrared video hosts x 12, universal angle ... panel with internal siren and back up li-ion battery, one magnetic door sensor, One pir detector, ...