White-Rodgers™ Low Voltage Thermostat, Economy Mercury Free, Mechanical Thermostat, 50 to 90 deg F Control, 2 deg F Differential, Snap Action Switch, RH, W Terminal Designations, Heat Only System Switching, 1 Stage, 1 Stages Heat, 1 mV to 30 VDC, Hardwired Power Source, Vertical Mounting, White, 2-7/8 in W x 1-1/2 in D x 3-3/4 in H Dimensions, Import