Pro 2000 Horizontal Programmable Thermostat, 20-30Vac, Heat-Off-Cool-Em Heat System Switching, Auto-On Fan Switching, 2 Heat/1 Cool Heat Pump, 40-90 Degree Heat Temperature Setting, 50-99 Degree Cool Temperature Setting Range, 5-2 Day Programming, Manual Changeover, Premier White, 5-90 % RH Non Condensing Operating Humidity Range, Dual Powered: Battery or Hardwired