Emerson 70 Series Economy Heat Pump (2H/1C) 5+2 Day Programmable Digital Thermostat, Backlit Display, 24 Volts Thermostat, 24 Volts, System Switch-Heat, Off, Cool, Cool, Emer. Fan Switch-Auto, On, Energy Management Recovery, Profile-Horizontal, Hardwired with Battery Back-Up, Range 45-90?? F., Terminals-R,C,Y,G,W2,E,O/B,L. Accessories; Wallplate F61-2550, Wallplate with Junction Box Adapter F61-2510