Specification: 1. For: MP3 player, Mp4 player, 2. Power Supply: 2* "AA" battery 3. Power Output: 3W 4. Frequency Response: 275Hz-20 KHz 5. Battery Life: Up to 7 hours 6. Cord Length: 250mm 7. Plug: 3.5mm stereo (L-shaped) Packing: 80pcs/ctn, outer carton size: 48*38*42cm, GW; 23kgs, NW: 22kgs Payment: 30% deposit, balance payment before shipment or LC at sight