Emerson Blue 4" Display, Universal Single Stage, Multi-Stage (2H/2C) Or Heat Pump (2H/1C) Non-Programmable Digital Thermostat, Backlit Display, 24 Volts or Millivolt, System Switch-Heat, Off, Cool, Auto, Emer., Fan Switch-Auto, On, Profile-Horizontal, Dual Power (R-C) And/Or Batteries, Range 45-90 F. Compatible with Comfort Alert Module Providing Compressor Protection. Now with Keypad Lockout and Setpoint Temperature Limits. Terminals-RC,RH,C,G,W/E,W2,Y,Y2,O/B,6,L. Includes F61-2634 Wall Plate.