I think it's an integrated feature of at least some of the chipsets incorporating the Mali 400 GPU.
The tablet I got is a NatPC 009S. Also sold as Tabtronic and probably a bunch of other names. It's a nice little thing for it's price. As mentioned, where they've skimped the most is clearly the screen, which doesn't measure up favourably to mid/high end Android phones, and much less to the high end tablets.
Note that I've not tested 2160p output, though, as I don't have anything that can display it, and given the marketing copy on some of these sites who knows, but that's what they claim anyway.
The tablet I got is a NatPC 009S. Also sold as Tabtronic and probably a bunch of other names. It's a nice little thing for it's price. As mentioned, where they've skimped the most is clearly the screen, which doesn't measure up favourably to mid/high end Android phones, and much less to the high end tablets.
Note that I've not tested 2160p output, though, as I don't have anything that can display it, and given the marketing copy on some of these sites who knows, but that's what they claim anyway.