This motion detector (PIR = passive infrared receiver) detects the presence of a person in a room. The units send information to a controller or any other associated Z-Wave device The sensor is a battery-powered device, which is in sleeping state unless an action is detected. After a programmable sleeping time the device wakes up and sends a status information. After this the unit goes back to sleeping modus. Batteries can be changed without unscrewing the device from the door or frame. The unit will give a visual warning on the device and sends a warning to the Z-Wave controller, when batteries need to be replaced. The unit offers a tampering control and sends an alarm message when tampered.