The product hasn't been shipped. The seller entered a false shipment number
A strong distorted hissing sound while playing music. Useless for playing music. I opened a dispute abd asked for a refund. I will add comments below once the dispute is finished. For now I do not recommend buying this speaker.
Got partially refunded (47 €) by aliexpress. In the end I paid 65-47=18€ for a speaker that can only be used for playing really loud music so that you do not hear the background distortion. I would not buy this again.