Elgato Eve Door & Window Wireless Sensor
Wirelessly monitor open doors and windows with Elgato Eve Door & Window Wireless Sensor. it can access your home’s personal data from your iphone, iPod, and iPad device using a free iOS app. With its Bluetooth 4.0 technology, it directly connect the device to your iOS smartphone or tablet without necessitating a Wi-Fi connection, network hub, bridge, or any other gateway device. Also, Works with Siri commands; for exapmple, you can ask for the current open/close state.