Nest Hello is a smart doorbell with HD video monitoring

Nest is getting into the smart doorbell business with Hello, a small, remote-sized device that can stream live HD video to your phone and send and receive audio. The doorbell, which Nest unveiled today at a hardware event in San Francisco, is part of a broader security push that’s building on Nest’s existing security camera business, itself part of an acquisition in 2014 of video-monitoring startup Dropcam.The Hello doesn’t have too many bells and whistles. The device has a 160