Thanks, Cap'un!
Some further points for good measure:
8. It's unusual that a trader who claims to be selling lots of stuff hasn't registered a limited company. (It's not illegal for a sole trader to sell things on the internet but most big, or even small, legitimate businesses would be run as a limited company).
9. The product is allegedly manufactured in the UK but the device in the illustration looks far more like an illegal 'fully-loaded' Kodi box, probably manufactured in China. A Google Images search finds the same device offered on a website which claims to be trading from London but which is actually using a private postal box (to hide the owner's identity), has also used a privacy service to hide the name of the domain registrant and which has only been in existence for 13 days:
https://www.moondustarcade.com/products/retropi-bundles-up-to-30-000-games?variant=37514563777
(Further, whoever set it up almost certainly isn't in the UK because they've failed to realise that a '1-800' phone number is a US one!)
10. The product is also shown on the website of a trader who is blatantly offering illegal 'IPTV' products to access subscription TV services without payment to the relevant companies:
http://theiptv.co.uk/
All far too dodgy for me!