Honeywell TH8321U1097 Universal Programmable Thermostat Large, Clear Display with Backlighting current temperature, set temperature and time are easy-to-read and all are displayed on the home screen Menu Driven Programming Guides you through the scheduling process, showing only necessary information and choices on each screen Ability to Select Multiple Days allows you to easily customize the thermostat for your unique schedule Real-Time Clock keeps time during power failure; automatically updates for daylight saving time Heat: 40 F to 90 F; Cool: 50 F to 99 F