The FIBARO FIB_FGK-102 door / window sensor is a Zwave compatible sensor that works on a battery. The sensor has 3 functions. It can be used for monitoring a door, window blind or garage door. The Binary sensor can be combined via a zwave network with, for example, motion sensors, flood sensors or alarm sensors. The sensor consists of 2 parts, 1 of which is mounted on the moving part and one on the fixed part.