RemoBell also runs on batteries and can be installed anywhere. But it doesn't connect to existing doorbell wiring, which means the doorbell won't chime inside the house, only on your smartphone. The August Doorbell Cam requires 16 24 volts of electricity and can replace only a wired mechanical doorbell. Field of View: Do you want a narrow view of just the person at the door, or do you want to see everything around your entryway?The Ring Video Doorbell 2 and Ring Pro boast 160 degree viewing angles, which let me see my whole porch and driveway. The RemoBell and August Doorbell cams have tighter angles, of 120 degrees. Video Resolution: The higher the resolution, the sharper the image, which will make it easier to identify people at your door.