以往，当我们不在家的时候，如果有人来访，除非事后来访者跟你说了，否则我们永远不会知道曾经有人来访过。从现在起，当你不在家的时候，你也同样可以知道是否有人来访过。

而这都要归功于Ring， Ring是一款可以连接Wi-Fi的无线门铃，可以让户主通过智能手机和Ring门铃上的摄像头看到来访者，甚至是利用Ring上的扬声器与麦克风和来访者进行通话，无论户主身在何处，只要手机有网络连接即可。

Ring门铃配备了一颗高清摄像头，并可以与用户的家庭Wi-Fi进行网络连接。当来访者按下门铃后，它会向用户绑定的智能手机发去通知提醒，用户打开手机应用程序就能通过视频串流的方式实时看到是谁站在门口，并允许用户通过麦克风与之交谈。

门铃的扬声器有噪音消除能力，以保证通话的品质。高清摄像机有一个鱼眼镜头，它能够捕捉到更广的视野，并拥有红外线LED，以保证夜晚也能清晰地捕捉图像。Ring捕获的所有镜头都会被记录下来，以便日后可以重新查看。

Ring的开发者表示，Ring易于安装，其可以连接墙内预留的电线，即使你家安装门铃的位置没有预留连接的电线也无须担心，它仅需要一颗电池就能保证一年的使用时间。Ring门铃将于1月19日开始正式销售，售价为199美元。

At Ring, our mission is simple: To reduce crime in neighborhoods. And by putting the power of home security in your hands, we’re making that mission a reality.

Ring keeps your home secure and your family safe by protecting you against intruders, burglars, package thieves and any other unwanted guests. Ring makes sure you never miss a visitor. Because with Ring, you’re always home.

Ring Video Doorbell lets you answer the door from anywhere. Whether you’re halfway across the world, or just too busy to walk to the door, Ring lets you see, hear and speak to visitors from the comfort of your smartphone, tablet or PC.

Ring sends you instant alerts when anyone presses your doorbell button or triggers the built-in motion sensors. From the free Ring app, you can see your visitors in brilliant HD video, and hear and speak to them with crisp two-way audio. You also get a free trial to Cloud Video Recording, which lets you review, save and share videos captured by Ring.

Ring Video Doorbell comes in four color options, so you can pick a finish that fits your home and your style. It’s weatherproof construction and infrared night vision means you can monitor your home around the clock—day or night, rain or shine.

Compatible with iOS, Android, Mac and Windows 10 devices.
Live video on demand available for hardwired Ring Video Doorbells.
Comes with a free 30-day trial of Cloud Video Recording.
Requires Wi-Fi connection.