The Z-Wave 3 in 1 sensor PHI_PSM01 is designed with three detection sensors:1. Door-/Windows sensor2. Temperature sensor3. Illumination sensorThe sensor consists of two parts; a Detector and a Magnet. They are designed to be fitted to doors or windows with the Magnet mounted on the opening part and the Detector mounted on the fixed frame. Opening the protected door/window will remove the magnetic field, trigger the detector and generate an alarm condition, (if the system is armed). The sensor can also applied to automatic light control, one scenario is to get the illumination lux level from built in illumination sensors and send a signal to Z-wave switch to turn the light on once we open the door when the room is dark.Every time when Door/Window trig, the sensor will also send temperature and illumination value as well. Also the temperature will send out the value when temperature changes. Note: The illumination sensor does not work with Fibaro Homecenter 2 and Zipabox yet.