Here’s a fun little sound system you can connect to your portable media player. ZumReed’s Pocket DJ Speaker looks like a tiny little turntable.
The mini speaker is small enough to carry on your keychain, hang from a briefcase, bookbag or purse strap. In keeping with the turntable theme, volume is controlled by spinning the mini platter (which also happens to be the speaker grill) clockwise or counterclockwise.
They’re available in three colors: black, white and orange, and aren’t much bigger than your average media player. Each speaker has a built-in rechargeable battery which gives about 3 hours of sound for a 1 hour charge in you computer’s USB port.
I haven’t had any luck finding these outside of Japan so far, but if you happen to speak the language, you might be able to grab one over on Dreams6 for ¥2980 (about $32 USD).