Review on KONG KIM LED Waterproof IP67 Portable Wireless Bluetooth Speakers V4.0 - HD Sound and Bss for iPhone, iPod, iPad, and Phones by Dawn Phelps

Decent sound. It doesn't need more. Doesn't swim very well. Anytime it gets water on it the volume really mutes, so you have to chase it down and then smack a towel or whatever to get the water out of the speaker holes. Charging is terrible. Holds a charge for a couple of hours at best. And it takes at least a full 24 hours to charge. Longer if you don't notice that the USB connector is disconnected because it's not very tight. Spend the extra $20 and buy another floating speaker from Revain and don't waste your time.