1. Doorbell of anker operates with 2k technology

Battery-powered 2K video doorbell --------------- 4:3 display ratio ensures comprehensive visibility and gives you perfect viewing angle every time clarity: a sensor gives you Sony's built-in 2k and professional lens display activity with perfect image accuracy Half-year coverage of a single charge or non-stop power source via wired connection Take full control of what's discovered with a motion sensor, intelligent human discovery and areas of activity. Receive real-time alerts when anyone approaches so you don't miss delivery or make guests