tado? additional Smart Radiator Thermostat Duo Pack (vertical mounting) - Add-ons for Multi-room Control The Smart Radiator Thermostat uses your phone\'s location to control a room radiator. It turns the heating down when no one is home and starts to pre-heat when it detects the first person returning. If you already have a Smart Radiator Thermostat - Starter Kit or a Smart Thermostat - Starter Kit of any version (V2/V3/V3+) then you can supplement these with additional Smart Radiator Thermostats to independently control multiple radiators. Additional product of the tado? Starter Kits: add additional Smart Radiator Thermostats to your setup to control multiple radiators and zones individually. Upgrade to Multi-room Control to maximise your comfort and energy savings. Manage all zones and settings within the tado? app Works with all standard radiators with thermostatic radiator valves. Simply replace the old conventional radiator thermostats - no tools needed tado? Starter Kit (V2, V3, V3+) including the Internet Bridge forms the basis of your setup Box contains: 2x Smart Radiator Thermostat (vertical mounting), various adapters, 2x 2 AA batteries