Braeburn Model 5220 Multistage Programmable Thermostat - Replaces Model 5200. Excellent choice for property owners who need to control their heating and cooling bills! The universal auto changeover thermostat shall be a Braeburn model number 5220, 3.86" high x 5.11" wide x 1.42" 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 all user, installer and program 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 two stages of heating and two stages of cooling, and heat pump systems with up to three stages of heating and two stages of cooling. Also compatible with 250mv - 750mv millivolt heating only systems and 2 or 3 wire hydronic zone systems. The thermostat shall have a bright blue backlight display, SpeedBar, separate sub-base and multi-level keypad lockout. Temperature control r