The Philio 4in1 Multisensor combines a PIR (Motion) sensor, door/window sensor, light sensor, and temperature sensor, all in one small package. The detector includes four sensors Ezlo Secure controller. PIR (Motion) Monitors changes in infrared level and movement that indicate a person’s presence. Door/Window Sensor Detects the opening or closing of a window, door, gate, or roller blind and sends an alert to the Z-Wave network. The Smart light sensor Measures a room’s light level (LUX) and reports this to the Z-Wave network Temperature sensor Control and measures any room’s temperature. The sensor’s Lithium battery should give you more than 2 years of use in normal situations, the Smart light sensor sends an alert to the network when the battery needs replacing.