Outdoor 4 is our fourth generation wireless smart security camera that helps you protect your home inside and out right from your smartphone. See and speak from the Blink app – Experience 1080p HD live view, infrared night vision, and crisp two-way audio. Two-year battery life – Set up yourself in minutes and get up to two years of power with the included AA lithium batteries. Enhanced motion detection – Be alerted to motion faster from your smartphone with dual-zone, enhanced motion detection. Works with Alexa – Connect to an Alexa-enabled device to engage live view, arm and disarm your system, and more using your voice. Includes three Outdoor 4 cameras, one Sync Module 2, six AA lithium metal batteries, three mounting kits, one USB cable, and one power adapter.