... used to furnish audio frequency for PCs, music mobile phones, MP3/MP4s, CD palm players, and other portable fixtures Listing Description ... :Li-ion Battery 3.7V ,600mAhOutput Power3WFrenquency Response80Hz-18KHzSource:TFcardPC,MP3,MP4,MD,CD, DVD player, Mobile phone,etc card, PC ... , MP3, MP4, MD, CD, DVD player, Mobile phone, etcPacking P/S 54* ...