Ring Doorbell 4 - Smart Wireless Doorbell Camera with Previews. It's new and in the box, sealed. Bought straight from Ring, just didn't end up needing an extra doorbell. - Works with Alexa - Ring app - Pre-roll function - Night vision with sharp contrast - Wired/battery-operated - Supports Apple iOS and Android devices - Easy mounting (hardware included) - Wi-Fi Connectivity & more