Here is another smart doorbell that lets you see who is at your door. The Arbor video doorbell and hub let you see who is at your door and talk to them through your phone. It comes with built-in chime, alarm, and 700 ft. WiFi range. You can install the kit in a couple of minutes without destroying your door frame (only a couple of screws are required).
The Arbor doorbell has a 115dB alarm to scare off thieves. Its camera has 1080p resolution, 5x digital zoom, and night vision. Expected to ship in July. More info is available here.