The Pyle PMS6 Bass Expanding Chainable Rechargeable Mini-Speaker (White) is designed for iPod, iPhone, MP3 players and laptop computers, but it's compatible with any audio device that has a 3.5-mm audio jack. The Mini-Speaker produces 10W of power output and features a unique vacuum bass design that results in surprising volume and bass response. Plus, you can daisy-chain multiple Mini-Speakers together to achieve a huge sound. They make an excellent replacement for laptop speakers and can fit in your hand or pocket for quick and easy portability.
The Mini-Speaker has built-in rechargeable lithium-ion batteries that can last up to 4 hours and take only 2.5 hours to charge via DC 5V 200MAH-300 MAH and 4 hours via USB.