CH7300 digital room thermostats are multi-functional devices that offer a simple-to-use user interface. Large press button makes it easy to be operate. This stand-alone heat pump thermostat is designed to program and configure temperature control of a wide range of heating and cooling equipment in both residential and commercial applications. Item No.: CH7300 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.