The 2Nd generation Nest learning THERMOSTAT has a new, slimmer design, is enclosed by a solid stainless steel ring, and Works with 95% of low voltage systems. The Nest learning THERMOSTAT learns what temperatures you like, turns itself down when you're away and can be controlled from anywhere over Wi-Fi. By programming itself, the Nest THERMOSTAT can save up to 20% on your heating and cooling bill. You just have to teach it well.
From the Manufacturer
The Nest Learning Thermostat programs itself and automatically saves energy when you’re away. Control it from anywhere using your smartphone, tablet or computer.