A boombox you can take into the pool, or even the ocean.

EcoTerra Boom Box  Here’s a neat gadget for the beach, mountains, pool, etc. This floating (IPX7) waterproof iPhone/MP3 player case is fully submersible in water. It’s powered by 4 C-Cell batteries, (not included) or via the included AC Power Adaptor. Two full-range 3" forward firing speakers can be played in virtually any position, even in the water, where they’ll float facing up! The internal waterproof storage compartment holds and protects keys, MP3 player, credit cards, etc. Although you can use any MP3 player via it’s headphone jack, (assuming it fits inside the case) you have the most control over iOS devices, like the iphone, iPod, iPod Touch. With those devices you can play, pause, advance or go back in your music library. With other devices, you can control the volume with the dials on top of the unit. The EcoTerra Boom Box amplifies tunes, but it doesn’t charge the device you use. MSRP: $150.

http://www.gracedigitalaudio.com/eco-terra-p-159.html