August Wi-Fi Smart Video Doorbell: This doorbell lets you see who's at the door from wherever you are via a downloadable app. The 1-way video camera allows you to view and speak to your visitor without them seeing you.
I tried SkyBell and it just never worked right always down 50% of the time. So I switched to August smart Doorbell and haven't looked back. Works consistently, build quality is better than the skybell, and Support is US based not in some foreign country. Highly recommend it if you haven't bought one or are on the fence or thinking of switching from a competitor.