Pro1® Thermostat, Non-Programmable Thermostat, 0.2 to 2 deg F Differential, Relay Switch, 2 Switches, RH, RC, C, Y, W, G, B, O Terminal Designations, 2 Stage, 1 Stages Heat, 1 Stages Cool, 4 sq-in LCD Display, 24 VAC, Battery/Hardwired Power Source, Junction Box/Wall Mounting, Black, 4.7 in W x 1.1 in D x 4.4 in H Dimensions, Import