Hunter Universal 5/2-Day Programmable Thermostat is pre-programmed with easy-to-change presets for weekdays and weekends, and manual or vacation override. It features four programmable periods a day, allowing settings for wake, leave, return and sleep, providing accuracy for precise, comfortable temperature control. The option of using the pre-programmed settings can save money by optimizing energy usage while heating and cooling throughout your home. It also has an INDIGLO Night Light as a backlight for easy viewing in the dark. Convenient 5/2-day programming capabilities allow you to customize programs to best suit your lifestyle and habits. Default display is in Fahrenheit but can be changed to Celsius. Uses 2 AA batteries (not included).