Wireless window/door contact with solar cell and battery (lifespan 8 years) 75x25x12mm. Fastened by gluing. Wireless window/door contact with solar cell and battery 75x25x12mm. The window/door contact FTKB supplies itself with a solar cell when there is 100 lux of daylight or more, otherwise it supplies itself with a button cell for several years. When the device is closed and opened, the relevant telegram is sent twice in quick succession. The current status telegram is sent cyclically approximately every 8 minutes. Fastened by gluing. Dimensions window/door contact LxWxH: 75x25x12mm. Dimensions magnet LxWxH: 37x10x6mm. If the power supply from the solar module is not sufficient, the electronics are supplied for several years by an internal CR2032 button cell. To change it, you only have to open the housing. This is also necessary to activate the battery supply by pulling out an insulating strip. When the learn button is pressed, the sensor learn telegram is sent. When the learn button is released, the voltage telegram is sent with the same ID. The current voltage telegram is sent cyclically approximately every 60 minutes. To learn into an actuator that is ready to learn, the housing must be opened and the internal button pressed. If window-door contacts FTKB are learned into switching actuators FSR14, links of up to 116 FTK are possible. Please refer to the operating instructions for the actuator. If window-door contacts FTKB are learned into switching actuators FSB14, FSB61NP or FSB71, lock-out protection is set up when the door is open, which blocks a central down command. Please refer to the operating instructions for the actuator. If window-door contacts FTKB are learned into switching actuators FHK14, FHK61, FZK14 or FZK61, heaters and air conditioning units are switched off when the window is open. Both the window-door contact and the magnet have a notch of around 10 mm as a mark where they must be next to each other when the window is closed. Their distance must not be greater than 5 mm. The wireless sensor can be programmed into the following actuators and the Professional Smart Home Controller: F4HK14, F2L14, FGM, FHK14, FHK61, FMZ14, FMZ61, FSB14, FSB61, FSB71, FSG14, FSR14, FSR61, FSR71, FTN14, FTN61, FUD14, FUD71, FUTH65D, FZK14, FZK61.