Nest's latest camera is packing some pretty impressive tricks under that friendly, unassuming exterior. The camera not only can record ultra high-definition video at 4K resolution, but now has built-in face detection to recognize familiar faces and warn when users when a stranger is in the house. It also features built-in video encryption, night vision, and speakers that are 7x more powerful than the original camera and a three-microphone system brings clearer audio. 

$299, nest.com