The T9 Smart Thermostat works with Smart Room Sensors to focus on the rooms you choose by setting a schedule — or let the sensors respond to your lifestyle, helping save energy when you leave and preparing that ideal temp for your return. With the Resideo app and geofencing, the T9 knows when you're coming or going, so you can come home to comfort and save energy when you're away. Plus, you can conveniently manage the T9 using the Resideo app, or use Amazon Alexa, Google Assistant, Apple HomeKit, Microsoft Cortana, Samsung SmartThings, and more. Honeywell Home White Smart Thermostat and Room Sensor with Wi-Fi Compatibility | RCHT9610WFSW2003/W