The universal auto changeover thermostat shall be a Braeburn model number 5320, 3.94" high x 5.56" wide x 1.19" deep, powered with either 24 Volt AC or with two "AA" Alkaline batteries (3.0 Volt DC). In the event of a power failure, the unit shall retain clock settings and universal 7 or 5-2 day or non-programmable settings. The thermostat shall be compatible with low voltage single stage or multi-stage gas, oil, or electric conventional heating or cooling systems with up to three stages of heating and two stages of cooling, heat pump systems with up to four stages of heating and two stages of cooling and 250mv - 750mv millivolt heating only systems. The thermostat shall have a bright blue backlight display, touchscreen with SpeedBar?, separate sub-base and multi-level keypad lockout. Temperature control range shall be between 45? and 90? F (7? and 32? C), accuracy of +/- 1? F (+/- .5? C). Operating humidity range between 5% and 95% relative humidity. The thermostat shall include separate installer and user setup modes, residential or commercial setup modes, permanent non-volatile memory to retain user settings, Filter, UV and humidifier pad check monitor, adaptive recovery mode (ARM), programmable independent fan control, residual cooling fan delay, indoor or outdoor remote sensor capability, auxiliary heat fossil fuel programming, and compressor power outage protection. A front reset button will return user settings to default values when pressed. This thermostat shall meet California Title 24 Guidelines.