The Honeywell RTH221B basic one week programmable thermostat is a simplified and easy to use one week programmable thermostat. This one-piece thermostat has one hassle-free program for every day of the week. The additional bonus of choosing between four preset options such as wake, leave, return and sleep add versatility to an already flexible thermostat. The RTH221B utilizes a crystal clear digital display that allows for precise temperature control. This thermostat is compatible with heating, cooling and heat pumps without auxiliary heat options.