Surface-mounted wireless humidity sensor 3 V with touch function. Five different modes can be switched via a touch field: Outside the house, At home, Timer, Eco and Comfort. The sensor can be placed anywhere in the house. Any number of humidity sensors can be connected to a ventilation unit. The connection is confirmed using a status LED (red, green, orange). When a certain humidity level is detected in the air, the sensor automatically adjusts the air volume flow and thus ensures fresh air throughout the building. AA batteries included.