The Arlo Ultra is a 4K security camera that you can place inside our outside of your home. This is because it is a wire-free and weather-proof camera. So it can be placed virtually anywhere. The reason that Arlo has gone with 4K resolution on the Ultra is because it allows for better zooming capabilities. So you are able zoom in and see who is in your home or outside your home, without it being super blurry. It also allows for better night vision. Now the Arlo Ultra can be used in conjunction with the Video Doorbell. Since you can check them all out from the same app. The Video Doorbell is going to allow you to see who’s at the door, even if they don’t ring the doorbell. This is a great way to keep an eye on your home and your neighborhood. And be able to answer the door from virtually anywhere.