This looks like a great little device it runs a cut down retropie called (retrorangepi pc) Founder Pierre has made his second handheld since (Raspiboy) and this is looking to be a big hit amongst retrofans if you fancy pledging up for one links below.
With RetroStone rediscover your childhood video games! Alone or with friends (up to 5 players), in the train or on your TV!
Source https://www.kickstarter.com/projects/583173617/retrostone-ultimate-retrogaming-console?ref=discovery&term=retrostone