Amazon (AMZN) 4K streaming is now available for Prime Instant Video.

The Amazon 4K streaming option is avaialble to anyone with a Prime account and doesn’t cost any extra. Members of Prime will need a 4K or Ultra HD TV to watch videos at the new resolution, which has four times as many pixels as HD, reports PC Magazine.

Several titles are available for Amazon 4K streaming. These titles include the company’s original series Alpha House and Transparent, as well as movies from Sony and shows from BBC. New Amazon original series will also include 4K streaming options, PC Magazine notes.

Users looking to do some Amazon 4K streaming on their PC or Mac will be disappointed to find out that the service doesn’t extend to them. The exact reason for this is unknown, but it’s possible that it’s a form of protection to keep 4K shows from being pirated, reports PC World.

AMZN shares were up 1% as of Thursday afternoon.

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