1F83C-11PR White Rodgers Single Stage Programmable 7,

Single Stage Programmable 7, 5+1+1, 0 Digital Thermostat, 1H/1C Conv. or Heat Pump. Backlit Display, 24 Volts or Millivolt, EMR Recovery, Filter Change Reminder, System Switch-Heat, Off, Cool, Auto, Fan Switch-Auto, On, Profile-Horizontal, Dual Power (R-C) And/or Batteries. requires common wire for continuous backlighting.