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In addition, its quality HDR video, strong speaker and microphone, and well made and frequently updated Nest app were tops among the other video doorbells we've tested. While you need a Nest Aware subscription and its recurring cost to get the most out of it, the Nest Hello is the best video doorbell yet. Credit: Tom's GuideToday's best Nest Hello deals?$173. 88ViewRecommended RetailerReduced Price$229$189View$229View$287. 49ViewShow More DealsWe check over 130 million products every day for the best pricesHow Does A Video Doorbell Work?A video doorbell’s operation is probably not going to come as a huge surprise. Essentially, at its most basic level, the video doorbell works like this: There is a camera in the doorbell.