After couple weeks of testing, after reaching the customer services, btw they are very good at it, they heared me out. Gave me a replacement. The 2nd speaker was way better than the 1st one. For the money it's very good, great sound, nice battery life.
I got as well the musibaby M88, 5 Star rating for me, Sound out of this world for a small speaker, great bass, battery life is way more that i could have imagine. Totally Recommand this product, and seller =)