Thank you guys. I really appreciate your suggestions. After researching iBT85 and JBL Flip , I also find on google some information. Then this article appears:
https://technigital.com/loudest-blue...s-market-2018/
It's seem like an affiliate website, I guess. But the review is quite clear and clean, not kind of bias review. I also contacted to the webmaster of that website to ask for advise. They also recommend me buy or JBL Flip 4 or Vava Voom 21 (which is number 1 in their list)
So should I choose which speaker, guy?
Sorry if my question bother you