... .4G 863 FM channel 4.Fashion design with excellent voice 5.ROHS CE REACH. wireless Specifications:Driver Unit: 40mm Frequency response: ... sensitivity: -58±3dB Cord length: 2.1m Plug: 3.5mmUse for mp3,mp4,dvd,cd,psp,mp5,personal computer,hardisk player ... ,mobile,aviation and home apprance etc.OEM ODM open new model and customer modified acceptedheadphone Feautures:*New ...