Amazon Video Doorbell + Sync Module 2 | Two-way Audio, HD Video, black

"Introducing: Blink Video Doorbell | two-way audio, HD video, app notifications for doorbell rings and motion detection, easy setup, Alexa-enabled - wireless or wired (black/white).
Answer the door from anywhere - easily via your smartphone, with 1080p HD video during the day and infrared video at night, as well as two-way audio.
Benefit from long battery life, customised notifications, privacy settings and much more.
Receive notifications when motion is detected or someone activates your Blink Video Doorbell. Pair it with a Sync Module (sold separately) or connect it to your doorbell wiring for on-demand live video and two-way audio.
Use the device wirelessly or connect it to an existing doorbell wiring to make your door chime sound as well. When used without wiring, you can use your Blink Mini camera (sold separately) as an indoor plug-in door chime.
You can easily set it up yourself in just a few minutes: Insert the included AA lithium batteries and connect to Wi-Fi via the app.
Works with Alexa - You can receive notifications and answer a doorbell with two-way audio using certain Alexa devices. When connected to an existing doorbell wiring or used with a Sync Module, you can simply ask Alexa to respond to visitors at your front door.
The scope of delivery includes a Blink Video Doorbell and a mounting kit (including screws and plugs). The Sync Module 2 included in all system sets listed above is not supplied (recommended for optimal use on battery power).
The door is the portal into your home. Welcome visitors and protect what's important to you with the Blink Video Doorbell."