Grandmax Mini Tweakers Portable Palm-Size Speakers for iPod / Mp3 Players and Laptops, 5V DC Charge Voltage, 100Hz - 20KHz Frequency Range, White

The Grandmax Mini Tweakers portable palm-size speakers (White) are Chainable speakers. It's unique design allows you to chain multiple Mini Tweakers to increase sound and increase fun! Each speaker has a built-in lithium battery which lasts hours of music playing on a single charge. And when battery runs low, it is rechargeable through any standard USB port. It's frequency-tuned amplifier delivers crystal clear sound.