- Magnetic switch for monitoring windows and doors ,- Door / window contact for integration into your own WiFi network via the free Hama Smart Solution app ,- Works without gateway/bridge ,- Displays the status: Door / window open or closed ,- Status can be checked using voice command, Amazon Alexa or Google Assistant ,- Built-in manipulation protection ,- Push notification if the status changes or there is an attempted manipulation ,- IFTTT compatible ,- Low consumption ,- Voltage supply via two batteries (AAA) , ,System Requirements: ,- Operating system: Android 4.3 and iOS 8.0 or later