Total Security motion detectors use passive infrared technology ensuring maximum security at your home or business. It is used to sense movement of people, animals, or other objects Detects motion up to 8m Dynamic range of 45 degree Operates with CR2450 batteryNOT INCLUDINGand can be used DC5V Power Supply Mini Design When the P831 Motion Detectorbe triggered,it will sound and send signal to the system panel.The alarm system host will sound andsend SMS/call to you preset phone number.You will receive the notification at the first time With a magnetic swivel base, you can just stick P831 motion detectoron it and twist it in any directions