2.5mm Headphone Charging cable, VONOTO 2 Pack 2.5mm Male Jack Plug to USB A Male Stereo MP3 MP4 Headphone Earphone Data Charger MIC 4 Pole Audio adapter for MP3,MP4,Headphone VONOTO 2.5mm USB adapter Convenience 2.5mm Jack Plug USB Data Charger Cable for MP3 MP4 Cable length: 9cm / 3.5", Total Length: 17cm / 6.7" 2.5mm MP4 Charger Cable: high speed USB 2.0 This cable only suitable for MP3, MP4 with 2.5mm jack. also suitable for cellphone with 2.5mm jack in charging function