Drayton by Schneider Electric Smart Radiator Thermostat, Black

From the manufacturer

This radiator thermostat is only designed to work alongside an existing Wiser Smart Heating System with a Wiser Heat Hub. Replace your existing radiator TRV valves to give room-by-room heating control.
Simply screw off/on existing TRV radiator valves and replace with Wiser smart thermostats to expand your current system. Works with 90% of existing valves. An adaptor to fit the Danfoss RA valve is included in every box.
Full heating control can be monitored and schedules updated via the Wiser App (IOS and Android).
Use voice commands to check the status and make changes to individual rooms or groups of rooms. Fully compatible with Alexa, Google Assistant and IFTTT.