The Diamond Mini Rockers speaker is a pocket sized power house. The MSP50 comes with a patented retractable portable cable so no cords get tangled during transport. This portable mini speaker is only 1.5 inches x 2.0 inches when compact, making it the perfect size for quality sound on the go. The speaker twists open to expand for extra resonant bass. The MSP50"s lithium battery is fully rechargeable through the included USB Charge/Audio cable. One charge provides hours of playing time. Perfect for MP3 players, smart phones, portable CD players, net books, and laptop computers. The Diamond Mini Power speaker comes equipped with a standard 3.5mm audio input jack for easy plug and play.