The speaker is truly one of the tops on amazon. The bass is really great, the sound is very powerful. I managed to get it at a good price and I really think I made a good purchase. I needed an excellent level case and the 3 things it had to have were: small size, powerful sound, IPX7. It satisfied me a lot, the connection is immediate, I am very strong and I even took it to the beach and it didn't give me any problem. I also put it at a party with 15/20 people as the main case from which the music came out and the music literally invaded everywhere, I couldn't even put it with the volume at maximum. I think I used it for 18/20 hours in a row and it didn't give me any kind of problem. EXCEPTIONAL product.