The TU 4 RF KNX is a 4-channel RF radio button interface. The device it is complies with the secure standard. The inputs are potential-free and can be connected to conventional push buttons or signal contacts. Channel 1 can be configured as a temperature sensor input. The programmable functions in the ETS are switching, dimming, blinds, temperature measurement and sending. Installation is easy thanks to a particularly compact housing which makes it possible to place it in 502 and 503 boxes.