About this item See more at your front door: See a person from head to toe or a package on the ground with a 180- degree viewing angle. See a clearer picture: Detailed video in HD with HDR ensures you see the details even in low light or bright conditions. Respond quickly: Hear and speak to visitors at your door with clear two-way audio or respond with pre-recorded quick reply messages when you are busy. Alerts that matter most: Receive notifications when motion is detected for people, packages, vehicles, and animals with included 3 months trial of Arlo Smart. See events before they happen with Arlo Foresight: See video prior to every motion-triggered video recording, so you never miss a moment See who’s there, even at night with night vision. All Video Features : HDR, SIP video call at doorbell push Weather resistant: Built to withstand the heat, cold, rain, or sun. Ward off unwanted guests: Set the built-in siren to trigger manually or automatically during an event. Secure local storage: Secure your videos directly to your Arlo base-station or Smarthub and view them anytime and anywhere. Video Modes : 1536×1536, 1080×1080, 720×720, 1:1 ratio Important installation requirements: Wired doorbell and chime with existing electrical wiring with voltage between 16V AC and 24V AC and a 10Va Transformer.