Answer your door no matter where you are from your smartphone with 1080p HD day and infrared night video and two-way audio. Experience long-lasting battery life, custom alerts, privacy settings, and more. Get alerts when motion is detected or someone presses Video Doorbell. Connect to existing doorbell wiring or pair with a Sync Module (sold separately) to engage live view and two-way audio on demand. Choose to save and share clips in the cloud with a free 30-day trial of the Blink Subscription Plan or locally with the Sync Module 2 and USB drive (each sold separately). Designed for every home Connect to your doorbell wiring to sound existing in-home chime. Alternatively, get alerts on your smartphone, or use Blink Mini or Blink Mini 2 (sold separately) as an indoor plug-in chime, without wiring. Set up yourself in minutes with the two included AA lithium batteries then connect to wifi in the app. Works with Alexa Receive alerts and answer with two-way audio. When paired with a Sync Module (or wired with a compatible in-home chime), just ask Alexa to answer the front door. Includes one Video Doorbell, 2 AA 1.5V Lithium Batteries, 4 Screws, 1 Case Opening Tool. Does not include Sync Module 2 which can be found in all Systems above (recommended for optimal use while on battery).