If Ring doorbell is rung, then Arlo records for 30 seconds

This helps when your Arlo is set up near your doorbell but is not activating quickly enough to catch the full event on it's own. Instead of waiting for Arlo's motion sensor to catch the movement or raising it and risking false alarms, you're using the doorbell as that trigger. You'll be able to select which doorbell triggers this (in the event you have multiple doorbells) and which Arlo camera to record with. You can also choose to record for 10, 30, or 60 seconds.