Emerson 1F78-151 Single-Stage Programmable Digital Thermostat, 5-2 Day Easy-to-read display with backlight 5-2 day programmable - set different schedules for weekdays and weekends Compatible with single-stage heating, cooling and heat pump (without aux) systems Precise temperature control of plus/minus 1 degree F Battery-powered for maximum compatibility - two AAA batteries included for your convenience