Hunter Universal 7-Day Programmable Thermostat is compatible with most furnaces and cooling systems and specially designed to install easily in five minutes. Convenient 7-day programming capabilities allow you to customize programs to best suit your lifestyle and habits. The Save Away one-touch override feature maximizes energy- and cost-savings opportunities when you are away, and Home Today override keeps you comfortable on days when you would normally be away from home. An energy guide provides you with instant feedback on energy savings as settings are changed. The high-contrast LED backlit digital screen makes it easier to read and program temperatures throughout the home. Uses 2 AA batteries (not included).