The coolest thermostat on the planet. Honeywell programmable digital thermostat. Touch screen programing. So simple to use you do not even need to read the manual. Designed for use with single stage gas, electric heat or heat pump systems. Will tell you outdoor air temperature when installed with outdoor air sensor available as an optional extra on this site. Service reminders for filters, humidifier filters, ultraviolet lamps and thermostat batteries. Will run off batteries or a common wire if you wish. Too many features to list. Read owners manual for additonal data.