The Braeburn 2030 is a universal programmable thermostat that is 4.25” high x 5.12” wide x 1” 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 will retain all user, installer and program settings. The thermostat is compatible with low voltage single stage gas, oil, or electric heating or cooling systems, and single stage heat pumps. Also compatible with 250mv – 750mv millivolt heating only systems and 2 wire hydronic zone systems. The thermostat has a bright blue backlight display and a separate sub-base. Temperature control range is between 45 and 90 F (7 and 32 C), accuracy of /- 1 F ( /- .5 C) and operating humidity range between 5% and 95% relative humidity. The thermostat includes separate installer and user setup modes, permanent non-volatile memory to retain user settings, filter check monitor, adaptive recovery mode (ARM™) and installer lock mode.