Key Features. Wired programmer for direct connection to your boiler Wirelessly connects to your tado° smart thermostat Easy DIY installation – start using it straightaway Requires tado° smart thermostat starter kit v 3 Replaces a hot water controlling programmer Controls heating based on sensor data from the tado Smart Thermostat Compatible with the UK standard programmer backplate Get the freedom to place your tado° smart thermostat wherever you like without costly rewiring thanks to this clever extension kit. It connects directly to your boiler using the existing wiring so you can move your wireless smart thermostat to the ideal location. Once its set up it connects to your tado° thermostat via radio waves allowing you to set the perfect temperature wherever you are in the house. Theres no need to call an engineer out either as its straightforward to install yourself getting you up & running in no time at all. Please note this product only works in conjunction with the tado° smart thermostat starter kit v 3 (sold separately). Whats in the box. 1 x Tado Extension Box 1 x Connection cable 2 x different connection plugs 1 x Terminal block 1 x Mounting screws 1 x Cable labels..