... operation.Main function:Bulit-in passive Infrared: infrared sensor technology and the human motion detection technology drives the dual protection for 'X3', ... gas detector etc., can monitoring several kinds of alarms. Alarm receive status: Preset 3 groups SMS, 3 groups MMS, ... gas leak, fire and other accidents,and give remote alarm Installed at the door, window, balcony door, important drawers ...