The Technical Pro Boombox2 (Silver) has a built-in lithium battery which means you can take it anywhere. No electrical outlet, no problem. Additionally, the Boombox2's compact design and lightweight make it even more attractive to just grab it and go.
Although relatively small in size when it comes in audio inputs the Boombox2 is like a Swiss Army Knife. With an integrated iPod / iPhone dock, USB Flash Drive input, TF Card input and 1/8" AUX input the Boombox2 can accept an audio signal from almost any device you can throw at it. That's why they recommend always having a Boombox2 not too far away. Because all it takes is a Boombox2 along with a couple of killer audio tracks from virtually any audio device to turn any room into a club atmosphere. The Boombox2 will typically crank out sweet tunes for about 2 hours depending on the usage.