whether connected to a thermostat or not

No need for additional batteries: simply charge the removable battery pack using a USB-C cable

For Wired Smart Thermostat Starter Kits

Additionally

but we recommend one Bridge X per 100m2 to ensure that each Thermostat has a consistent

factory refurbished bridge x SACC whether connected to a thermostatThe Bridge X connects all of your tado X products to the internet. You only need one Bridge X per home, but we recommend one Bridge X per 100m2 to ensure that each Thermostat has a consistent, reliable connection. Our Refurbished products may show signs of use, but have been extensively tested by us and are fully functional and as good as new.