Shenzhen CAVISION Co., Ltd launched 4K NVR, 4K UHD DVR, 4K IP camera and 4K UHD camera.

What Is 4K?

Ultra HD (4K), or Ultra High Definition, is the big step in HDTV resolution. The Consumer Electronics Association (CEA) defines an Ultra HD television as one that displays at least 8 million active pixels, with a lower resolution boundary of at least 3,840 by 2,160. There are multiple varieties of 4K digital content ranging from 3,840 by 2,160 to 4,096 by 3,112, but the 3,840 by 2,160 resolution is the most consistent number we've seen and the standard resolution most UHD/4K HDTVs and monitors have settled on. It's a nice, even number, doubling the horizontal and vertical pixels offered by 1080p (1,920 by 1,080 pixels), the current standard for high definition.

Collectively, the format was originally known as 4K, and while the CEA officially changed its designation to Ultra HD (UHD for short), the 4K label has stuck and both terms are effectively interchangeable.

How Is 4K Different Than 1080p?

Depending on the variety (discussed above), 4K generally offers four times the resolution of standard.1080p HDTVs.

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http://www.cv-cctv.com/en/Products.asp?Aid=81 please.