Never used Works with Alexa for voice control (Alexa device sold separately). Product requires C-Wire, unit will not work without it. Control your Smart Home with Amazon Alexa for voice control (Alexa device sold separately) and Apple HomeKit with voice control using Siri, the Apple voice assistant 7-Day Flexible Scheduling or Location Based Temperature control (GeoFencing). Uses geofencing technology to keep track of your smart phone's location;Auto changeover: The Lyric T5 smart thermostat can be set to determine if the home's system should be in heating or cooling mode to provide maximum comfort Adaptive recovery learns how long it takes to achieve the right temperature at the right time and automatically runs your system to get to your desired temperature when you want it, with auto change from heat to cool Smart Alerts - push notifications for filter changes and extreme temperature warnings keeps you informed Energy Star Certified.The Lyric T5 Wi-Fi smart thermostat is compatible with most single-stage and multi-stage conventional and heat pump heating and cooling systems. Provides remote thermostat control through iOS or Android smartphones and tablets. Compatible with Apple HomeKit and Amazon Echo