What is the Zappiti 4K HDR?
As the product name would suggest, the Zappiti Duo 4K HDR is Ultra HD capable as well as being able to output the necessary metadata for High Dynamic Range (HDR) video; the Zappitis are currently only compatible with HDR 10 so there is no HLG or Dolby Vision support, although the same can be said for all streaming media players on the market at this time.
There are three devices in the Zappiti 4K HDR series: the Zappiti Mini 4K HDR, the Zappiti One 4K HDR and the Zappiti Duo 4K HDR. In terms of audio and video capabilities, all the products should be identical in performance but there are physical differences between the three – the ‘One’ and ‘Duo’ allow you to add SATA hard drive storage, by means of their built-in bays and you will not be surprised to learn that the ‘One’ has one rack, while the ‘Duo’ contains two.
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https://www.avforums.com/review/zappiti-duo-4k-hdr-mini-android-media-streaming-player-review.13514