portable, but also produce a sound that's perfectly acceptable for out the door, on-the-go occasions...
iMainGo X Treme The iMainGo X Treme custom case fits and protects all iPods, iPhone, iPod Touch and most other MP3 player. It comes with an extra large device compartment, eliminating the need to remove most protective cases/skins from your device. The Treme can also be used as an external stereo speaker system for any device with a 3.5 mm connection, meaning it not only works with your iPad, laptop, kindle or cell phone, but even an electric guitar or portable gaming system. Premium high output stereo speakers, tuned porting for great bass reproduction and ultra-efficient digital music amplifier are paired with a battery life of about 12 hours. You can even daisy chain these speakers with other devices or speakers.
Digital Lifestyle Outfitters Speakers Very compact and always ready to go wherever you take them, the Outfitters create an ultra wide sound stage, with bass vents for richer, realistic sound. They also come with a rotating stand and can even work as a speaker phone in the event that a call comes thru in the middle of playing music or watching a video. Powered by AAA batteries for easy use on the go (an AC adaptor allows for power when you're inside).
HUMP NF01 These tiny speakers come with a provided USB amplifier module, so you just plug them into an empty USB port on your computer and they are ready to perform. Surprisingly, these small speakers encased in icy cool clear cabinets can produce impressive sound, all things considered. The sound is clearly lacking the low end, but they offer great stereo separation and decent treble.