Swann Video Doorbell - the smart way to see who is at your door.Flexibility First - You can operate 100% wire-free with the rechargeable battery, or connect to your existing doorbell wiring for maximum flexibility of operation. Get the Full Picture - See every detail with an ultra-wide 180° viewing angle. It has an aspect ratio of 1:1 for a powerful vertical view which means you can view people up close from head to toe, plus packages left at your door. Truly Reliable Security - Swann's True Detect technology senses the heat and movement of people, cars, and large animals for reliable alerts and fewer false alarms. You'll Never Be in the Dark - The SwannBuddy can even see in the dark up to 16ft (5m), with powerful infrared night vision that automatically kicks in as night falls! Talk to Visitors - Use the microphone and speaker to talk with people near the camera. Scare off intruders or ask the delivery person to hide the package somewhere safe. Never Miss a Visitor - The Chime Unit speaker lets you know when someone is at the door, with 6 chimes to choose from. Requires 2 x AA batteries (included). Local & Cloud Storage - Set & forget with free recording of clips to local memory (32GB micro SD included) or the cloud. Speak to See - Use your voice to live stream on any Hey Google or Alexa device with a screen, including Chromecast devices. Customize and use phrases like 'Alexa, show the front door' or 'Hey Google, show the garage'. Weather Resistant - The Doorbell Unit is built to withstand the elements, with IP56 rating. One App, Complete Security - Expand your security by adding Wi-Fi cameras and fully wired DVR or NVR surveillance systems, then manage everything under the Swann Security app. Depth: 32 MM 100% Wire-Free or Wired - Longer rechargeable battery life or connect to existing doorbell wiring True Detect - Heat, motion & person sensing for reliable alerts 1080p HD Quality - Crystal clear video, day or night Music to Your Ears - Includes portable battery-powered indoor chime with 6 selectable melodies Free Recording - Save clips to cloud & locally to SD card (32GB included in pack) Powerful Vertical View - Wide 180 Degree viewing angle & 1:1 aspect ratio to see who's at the door & what's on the ground Speak to See - Go hands-free with Hey Google or Alexa Height: 140 MM Width: 55 MM