Ordinary users in China really don't need to buy this: First, QQ software supports 720P at most, which requires both parties to have a network speed of1m/s. As long as one party can't reach it, it is an ordinary camera. Second, skype supports 1080P, but there are few domestic users. At the same time, the network speed requires 2m/s, as long as one party can't reach it, it is an ordinary camera. Thirdly, H.264 compression technology requires the use of QuickTime player, while free QuickTime does not support video recording. official website needs to spend $30 to buy a professional version. Advantages: Logitech's official software, Logitech webcam software, can really realize 1080P video recording and 1500 pixel photographing, and face tracking is more humanized.