ThermoSphere Bluetooth Programmable Thermostat 16A
A wireless temperature and humidity sensor for the BT21 thermostat. For use when your BT21 thermostat is not in the same room as your underfloor heating and you need an ambient temperature measurement.
 
Colour- White
Battery Life- 2 Years (No wiring needed, replaceable battery)
Connectivity- Bluetooth 4.2
Warranty- 2 Years
Size- 52mm x 5mm 
Protection Rating- IP67