Questions about MM+

Hello, I recently got really into retro games and after many hours of thinking about it I thought why not buy a handheld. Watched a couple of videos and my final pick is miyoo mini plus.

But I have a couple of questions to people who already have them: - are the speakers inside good? - is there a possibility of connecting headphones or Bluetooth headphones? - is miyoo official website a good place to buy this handheld or are there better websites to buy it? (It seems like s dumb question, but I have seen some people buy it on AliExpress).

Thank you in advance to all the answers, I'm really excited to buy mm+. Sorry for language, English is not my native language.