The Eve Door & Window sensor from Elgato senses whether your door or window is open or closed & shares the data with the Elgato Eve app on your Apple device. Set up connected devices to turn on when you enter the room, & more. Compatible with Apple's Home Kit technology, Eve Door & Window sensor connects directly with your iPhone or iPad over Bluetooth so no Hub is required. Key Features: With a download of the Elgato Eve app (available on i OS) on your iPhone or iPad, or by using Apple's Home app, you can easily check if your doors & windows are open or closed, for secure peace of mind View statistics of time & duration, & view remotely when connected via Bluetooth Check with your voice when your hands are full. Eve Door & Window sensor works with Siri via the app Powered by long-lasting replaceable battery so completely wire-free You can set up notifications to be received when anything equipped with the sensor is accessed Set devices like connected smart lighting or heating to turn on when you enter the room System requirements: Elgato Eve Energy requires an iPhone, iPad, or iPod touch with i OS 11.2 or later. Compatibility: Eve accessories are exclusively Apple Home Kit enabled To control this Home Kit-enabled accessory, i OS 11 or later is recommended. Controlling this Home Kit-enabled accessory automatically & away from home requires a Home Pod, Apple TV with tv OS 11 or later or an iPad with i OS 11 or later set up as a home hub.