Pro 1000 Horizontal Non Programmable Thermostat, 20-30Vac or 750mV, Heat-Off-Cool System Switching, Auto-On Fan Switching, Manual Changeover, 1 Heat/1 Cool Conventional Systems and Heat Pump with No Auxiliary Heat, 40-90 Degree Heat Temperature Setting Range, 50-99 Degree Cool Temperature Setting Range, ± 1 Degree Accuracy, 5-90% RH Non Condensing Operating Humidity Range, Dual Powered: Battery or Hardwired, Premier White