ring
The Ring Video Doorbell let you answer the door from anywhere using your smartphone. It features an HD camera with night vision, providing a clear view from your front door, day and night. The Ring Video Doorbell is wifi enabled, with motion detection, built in speakers and microphone.
In addition, the Chime is an extension that works with your Ring Video Doorbell to let you know when you have a visitor even if your phone is in another room. The Chime plugs into any standard power outlet.