For 10 euros, it has very good sound and a long Bluetooth range, over ten meters. However, the box says 4 hours of playback while the specifications on the website say 8. It remains to be checked who is right, but it seems that what the box says is true. I haven't tested the splash proof feature, but with exposed ports that don't have covers, it's probably not suitable for heavy water exposure. Also, it's a bit strange and opposite from the usual that holding the + and - buttons changes the volume, and with a quick press, it goes to the next/previous track.

Update, the battery lasted over 8 hours at medium volume