The Braeburn 5220 Premier Programmable Thermostat is a 3-wire, wall-mounted or surface-mounted device compatible with heat pumps and central heating radiators. It has a square shape, a digital display, and push-button controls. The thermostat is programmable with three periods per day and features a low battery indicator. It is designed for low voltage systems and has one heat and one cool stage. The model is from 2014 and comes in an open box. The thermostat is smart home compatible and uses AA batteries.