Easy retrofit/screw-fit replacement for an existing Thermostatic Radiator Valve, no special tools required. Save energy whilst increasing comfort by customising temperatures room by room. The handy boost button increases the temperature for a set time. Schedule/control heating from anywhere with the Lightwave App (WiFi link required). Suitable for indoor usage. Light power indicator. Fixings included for assembly. Size H8.5, W6.8, D6cm.