Meet the Turtle Shell 3.0: a rugged, wireless speaker with a waterproof design that you can take anywhere to enjoy your music. You can wirelessly connect 12 speakers using Bluetooth 4.2, with a range of 15 feet. Turtle Shell 3.0 can be taken underwater to 3 feet. It floats too.
The device has a 3600 mAh battery, which you can use to charge your USB gadgets. This rugged speaker is getting funded on Kickstarter at this time.