Key Features . HD Video with Night VisionMotion Notifications with Colour Pre-Roll video previewsTwo-Way TalkCustomisable Privacy SettingsRechargeable Quick Release Battery PackWorks with AlexaHeight 128 MMWidth 62 MM . Upgrade your front door Upgrade your front door with Video Doorbell 4. Enjoy enhanced dual-band wifi and colour video previews to get the whole picture. A few seconds all the difference Start recording before you even receive a motion notification with Colour Pre-Roll video previews. With up to 4 extra seconds of colour video you’ll know what happened before your package was delivered or other motion was detected. Never miss a visitor Get real-time notifications whenever a visitor presses your doorbell or triggers the built-in motion sensors so you\'ll know what is happening at your front door wherever you are.Includes a free 30-day trial of Ring Protect.Ships with Satin Nickel faceplate and a digital coupon for one free additional faceplate..