Introducing Blink Outdoor 4 — Wireless smart security camera, two-year battery life, local storage, enhanced motion detection, two-way audio, HD live view, Works with Alexa – 5 camera system (Black) Outdoor 4 is our wireless smart security camera with up to two years of battery life that helps protect what matters most, from the Blink app on your smartphone. See and speak to people and pets 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 — Get real-time alerts from your smartphone with dual-zone, enhanced motion detection. *Know who's there with smart notifications — Get person detection with embedded computer vision (CV) as part of an optional Blink Subscription Plan (sold separately). **Save and share clips — No monthly fees required when using local video storage functionality with the Sync Module 2 (included) and a USB drive (sold separately). Or choose to store events in the cloud with a free 30-day trial of the Blink Subscription Plan. 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 adaptor.