The Arlo Wire Free Video Doorbell Black is a smart doorbell with a camera that allows you to monitor the front door. When someone rings the doorbell, it starts a video call with your phone right away. In addition, you receive notifications when the doorbell detects movement in the activity zones that you've set. The doorbell works on a battery, so you can mount the doorbell anywhere and don't have to run any cables. This makes the installation easier than with a wired model. You can talk to visitors via the app, but you can also set standard voice messages. This doorbell has a built-in siren to scare off uninvited guests. You need a cloud subscription to view the footage. This subscription is free for the first 3 months.