Amazon's Ring has unveiled its new Video Doorbell Pro 2, boasting a bird's eye view, taller field of vision and virtual answering machine, among other new features. The device includes a 3D radar system that acts like a 'virtual fence,' allowing homeowners to set a perimeter around the property. The system notifies users when a person trespasses or a delivery person crosses the lawn to drop off a package. Ring has also includes a 'bird's eye view' feature that provides an aerial view of the property with a map and dotted lines providing context by indicating where motion started With 1536p HD resolution and an array microphone, the $250 device has the crispest picture and sound of any Ring.