Robin Good: Thanks to Alessio Palmieri who kindly suggested to give a look to it, here is another excellent alternative for anyone who is looking for a highly portable, battery-powered sound speaker.
The X-Mini II Capsule is a unique superportable speaker, which can fit in the palm of your hand while producing a very good and powerful sound.
Not only. The X-Mini Capsule has a battery life of at least 10 hours and it can also be daisy-chained to other X-Mini Capsule speakers to creare an even more powerful sound system.
Product Dimensions: 23.6 x 17.3 x 23.6 inches
Price starts at around $20.
Please note: Everybody seems to love them at first, but if you have enough time to read the actual customer reviews, you will find out that durability, battery issues and quality of construction may come to disappoint you.
Full set of X-Mini speaker models: http://www.amazon.com/s/ref=bl_sr_pc?_encoding=UTF8&node=172282&field-brandtextbin=XMI