Uses smartphone's location to optimize savings and convenience. Automatically maintains comfort by considering temperature, humidity and weather. No complex menus - 1-touch buttons on the thermostat and app saves time. Control from anywhere by smartphone or tablet. New App combines simplicity with advanced features. View weather outlook. Receive monthly energy reports via email. Auto-away mode. Daylight Savings Time ready. LED (light-emitting diode) display options: Celsius or Fahrenheit, 121 or 24 hr (hour). Thermostat and app language set by your smartphone or tablet. Does not work with electric baseboard heat, 110V (volt) or higher. Compatible with most other heating, cooling and heat pump systems. Optional24 VAC power ("C" wire). Battery power option. Comes with decorative wall plate and mounting hardware.