PROGRAMMABLE LOW-VOLTAGE THERMOSTAT (661484)

Blue 2″ Display, Single-stage (1H1C) 5+1+1 day programmable digital thermostat
Backlit display
24 volts or millivolt
System switch HeatOff Cool
Fan switch AutoOn
Profile Horizontal
Hardwired or battery powered
Range 45-90°F
Terminals R, C, W, Y, G, OB