Low Voltage Thermostat, Stages Heat 1, Stages Cool 1, Terminal Designations B, G, O, RC, RH, W, Y, System Switching Heat-Cool-Off, Fan Switching Auto-On, Display Blue Digital, Backlit, Key Pad Lockout No, Programmable Fan No, Humidification Control No, Dehumidification Control No, Remote Sensing Capability No, Battery Backup Yes, Low Battery Indicator Yes, Batteries Included Yes, Dual Transformer Compatible Yes, Power Method Battery, Voltage 20V AC, 750mV Compatible Yes, Height 5 1/4 in. This item has been restricted from sale in the following state (s): []