Kit Includes Honeywell RedLINK Wireless FocusPro Programmable Thermostat, Return Air Sensor, Equipment Interface Module, Wireless FocusPRO, 4 AA Batteries with Charger, and LCD Screen Cleaning Kit. The Honeywell Home Wireless FocusPRO Digital programmable Thermostat with RedLINK technology makes controlling temps remotely possible and installation without running wires simple. EQUIPMENT INTERFACE MODULE(EIM): All HVAC equipment is wired to the module. Module receives communication from the wireless devices. Maintains 62 F for heating and 82 F for cooling Displays outdoor temperature and humidity. Works with Alexa Works with the optional RedLINK Internet Gateway, Portable Comfort Control and Wireless Outdoor Sensor