Sony Portable Compact Speaker Dock with Remote for iPod classic, iPod touch (1st generation, 2nd generation, 3rd generation, & 4th generation), iPod nano (2nd generation, 3rd generation, 4th generation, 5th generation & 6th generation), iPhone (3G, 3GS, 4, & 4S), iPad & iPad 2
I bought this for our water aerobics class at my work.  It makes working out to good, clear music a blast!