The doorbell has alarm and mobile monitoring function, protect your home safety effectively, reduce your worried. You can monitor environment of your house via mobile phone whether you at home or not. Features: Wifi doorbell connects to network via wifi router.(15-30m) Mobile devices include smartphone or tablet, could connect to the doorbell. After the visitor rings, mobile devices coulde interact with doorbell via real time video and audio, unlock, take photos, take videos, and alarm. Answer the doorbell by smartphone, when someone press the doorbell, unlock the door from your smartphone on APP. Don't worry forget the your key, you can open the door by your smartphone. The camera has night vision and motion detection, when some strangers wander at your door without notice, you will get an alart sent from doorbell. Real-time alarm and proactive monitoring, ensure your security. Support 8 mobile devices can work at the same time. It is made of high quality, very durable.