1,earphones for MP3,MP4 2,In earphones 3,on promotion sale 4,welcome OEM.ODM 4,good quality with competitive price Metal earphone with earphone winderDriver Unit 2x15mm Frequency Resp 20-20KHz Impedance 32 ohm Sensitivity 115dB Max Input Power 3mW Plug 3.5mm Metal earphone with earphone winder