Programmable Thermostat: This digital thermostat allows you to set your desired temperature and schedule for optimal comfort and energy savings. Easy Operation: The intuitive controls and clear display make it simple to adjust the temperature or program settings. Wireless Remote Sensor: The included wireless sensor detects the temperature in another room for more accurate whole-home heating or cooling. Replacement unit for the older versions of CM721 CMS721 CM727 CMS727 CMS727E1016 CM927 CM921 CMS927 CMS927B1049 Wireless Room Thermostat & Receiver Energy Efficient: By programming the thermostat to your schedule, you can reduce energy consumption and lower utility bills.