Hive Radiator valves - manage your heating room by room from your smartphone and never waste money heating empty rooms Easy to control - manage it all from your smartphone via your Hive app to turn your Radiator on and off without affecting the heating in the rest of your home Precise temperature setting - Set the exact temperature you want in degrees, rather than just selecting a setting between 1-5 Installation in an instant - simply unscrew your existing TRV head and replace it with a Hive Radiator valve Accessible to all - Hive Radiator valves also work even if you don’t have Hive active heating, whatever system you have, you can manage your heating via the Hive app Hive Hub Needed for Alexa - Hive Hub is the essential brains of the operation. It plugs into your broadband router and connects all of your Hive devices wirelessly so they can be easily controlled remotely Width : 54.9mm, Height: 93.9mm (inc RA adaptor) , Depth: 54.9mm, Weight: 2.9101018584 Pounds, Manufacturer: Hive