Braeburn Builder products come with lots of features at a discount price. Includes a big 2 square inch screen that is backlit for easy viewing. Features: Huge 2 sq. in. bright blue backlit display. Fully adjustable temperature limits. Set up for hardwiring or battery power. Settings retained in permanent memory. Short cycle protection for compressors. O & B terminals are separate. Indicator for low battery. Shielded electronic circuitry with ESD guard. Reset button in front access area. Fahrenheit / Celsius switch. Gas / electric fan switch. Specifications: Dimensions: 1.38" D x 3.62" H x 4.72" W 5 Year Warranty 1 Stage Heating and 1 Stage Cooling Compatibility: Conventional and Heat Pump 2 Sq. in. Display Size Terminations: Rc, Rh, W1, Y1, G, O, B, C