MAKE SURE IT IS COMPATIBLE WITH YOUR REPLACEMENT . This model is wired with AA battery x 2 as back up for storing saved settings . The Whitbread Drayton Digistat +3 Plus Three 7 Day Room Thermostat 22100 is a programmable thermostat with a digital control style. It has a white colour and is powered by both corded electric and batteries. This thermostat includes batteries in the package and offers 6 periods per programmable day, ideal for maintaining a comfortable temperature in your room. The digital display feature makes it easy to read and adjust the settings, providing convenience and energy savings with its programmable functionality.
eBay