Small but impressively built, the new ZEN Stone is the answer to ready music on the move. Carry it on you as you dance to the beat of your workout music for this tiny dynamo pulsates with listening power. Specification : Capacity: 1GB Song Capacity: 500 WMAs/ 33hrs (64kbps), 250 MP3/ 16hrs (128kbps)1 Battery Type: Rechargeable Li-Ion Polymer (Embedded) Size: 53.67 x 35.34 x 12.82 mm Audia Support : MP3, WMA, Audible Connectivity: USB 1.1/2/0 Mass Storage Device : Yes