XSJ1311 Features: * Make adjustments for higher efficiency * Actively manage heating and cooling energy use within your home * Filters need to be changed or service is required * Enjoy the convenience of a 7 day program with up to 4 settings per day. Specifications: * Not for use with 120/240V electric baseboard heat, proprietary communicating systems, or radiant floor heating systems * Thermostat requires 24VAC power with minimum 5 wires for most single stage heating and cooling installations * Reduce energy consumption up to 10-15pct with the energy savings schedule Dimensions: * Overall dimensions: 3.9"" H x 5.75"", W x 1"" D