The Honeywell RTH3100C1002/A digital heat/cool pump thermostat has been redesigned to offer users peak performance in an incredibly simple and intuitive manner. Select your heating and cooling preferences with absolute precision with the model's highly responsive and intuitive design. Featuring a green backlit screen and a soft-touch button interface, the controls have been modified in an effort to make this thermostat the absolute height of accessibility. Should the power in your home ever give out, the RTH3100C1002 will employ an intuitive technology that will allow it to remember all of your previous setting and continue to function normally once power is restored. This model is specifically designed for heat pumps and should never be operated with any other systems.