Blink Video Doorbell Two-way audio HD video long-lasting battery life motion detection chime app alerts Works with Alexa Bla

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, customised alerts, privacy settings and more.
Get alerts when motion is detected or someone presses Blink 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 2 (sold separately) as an indoor plug-in chime, without wiring.
Set it up yourself within minutes, with the two included AA lithium batteries, and then connect to Wi-Fi using the app. The newly designed internal battery seal provides IP54 weather resistance rating.
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: a Blink Video Doorbell and mounting kit (including screws and fixings). Does not include a Sync Module 2, which can be found in all “Systems” above (recommended for optimal use while on battery).