The Honeywell Home 1-Week Programmable Thermostat has a simple interface and offers one basic program for the entire week with 4 program periods. It automatically adjusts the heating or cooling of your home so you are comfortable when you wake up, comes home, or at any other time you prefer. The Honeywell Home 1-Week Programmable Thermostat (Model Number RTH221B1039) has a simple interface and offers one basic program for the entire week with 4 program periods. Features include: * Simple programming (one program for entire week, plus four options per day) * Easy to use· * Precise temperature control· * One-year warranty· * Easy DIY installation. FEATURES * Program Your Week: Customize your comfort to fit your weekly schedule. The 1-Week Programmable Thermostat from Resideo lets you run one program for a whole week, with four periods per day to choose from including wake, leave, return, and sleep. It doesn't get any easier than one program for one week for a reliable home thermostat. * Accurate Temperature Control: Home comfort should always feel just right. That's why the 1-Week Programmable Thermostat is built with precise temperature control of +/- 1°F. This feature can ensure you get the performance you expect from your thermostat, and the comfort you deserve in your home. * As Easy As It Gets: From its ease of use in programming and temperature control, to its clean one-piece design and do-it-yourself installation capability, our 1-Week Programmable Thermostat offers simple, yet reliable performance to maximize your home comfort. SPECIFICATIONS * Energy Star Certified: Yes * Product Height: 3.75 in * Product Width: 5.75 in