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 five Outdoor 4 cameras, one Sync Module 2, ten AA lithium metal batteries, five mounting kits, one USB cable, and one power adapter.