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. Person detection ? Get alerts when a person is detected with embedded computer vision (CV) as part of an optional Blink Subscription Plan (sold separately). Save and share clips ? Choose to store events in the cloud with a free 30-day trial of the Blink Subscription Plan or locally with the Sync Module 2 (included) plus a USB drive (sold separately). 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.