This Wi-Fi Smart Thermostat is designed to bring comfort to people's life whether you are at home or on-the-go. The 4.3 inches colorful touch screen lets you adjustment the temperature,set the system modes easily.Integrated with Wi-FI 2.4Ghz,it allows you have the remotely access,change,or program your room temperatures at anytime, anywhere. Item No.: CH7100 A c-wire is required for all systems Works with two stages of heating and two stages of cooling (2H/2C) Works with Heat Only and Cool Only system  Works with Heat Pump (With or Without Aux) Works with Amazon Alexa, Google Assistant Remotely control your home comfort from your smartphone Using the free mobile app for Android and iOS devices. 4.3 inch TFT Capacitive Touchscreen Display