Sensi WiFi thermostat features remote access programming from a smartphone, tablet or PC (personal computer) through the use of geofencing smart feature. Integrates with Apple HomeKit, Amazon Alexa and Wink smart home platforms, and works with Google Home and Google Assistant via the free Wink app. Universal design works with virtually any system. Can be hardwired for power or use two replaceable batteries for most applications. Works with the wires in most homes. No "C wire" required (except HomeKit) for most HVAC (Heating, Ventilation and Air Conditioning) applications for faster and easier installs. Connect the thermostat to a home Wi-Fi system with the step-by-step guide provided in the Sensi thermostat mobile app. The mobile app can store up to nine different schedules and manage multiple thermostats on the same app - even at a second home. Features include large backlit display, auto heat/cool changeover option, humidity sensor, A/C compressor protection, control to +/- 1 degree, permanent program retention during power loss, location based temperature and weather display, automatic Daylight Savings adjustment. Sensi thermostat sends service reminders to help keep the heating/cooling system running efficiently.