The Nest Thermostat is a smart thermostat that learns the homeowners' habits and then automatically adjusts the house's temperature. Nest Protect is a smoke and carbon monoxide alarm that warns users before it sounds and can be deactivated easily by waving an arm at it. Both devices can be controlled from the user's mobile phone. The Nest API allows users to control the Nest Thermostat and Nest Protect as well as display their current configurations. By using the API, developers can integrate Nest Thermostat and Nest Protect with their own products, applications, or services.