http://www.100-gift.com/rss/154/1190/Mobile-Handsfree-Earphone_1.xml Mobile Handsfree Earphone Wholesale,china Mobile Handsfree Earphone Suppliers, Manufacturers, Exporters en-us Promotional Gifts Center http://www.100-gift.com/custom_product/154/1190-1/Mobile-Handsfree-Earphone-4177.html Specifications: 1) Driver unit: ?15mm Mylar speaker 2) Frequency response: 20Hz - 20kHz 3) Impedance: 32 ohms ± 10% 4) Sensitivity: 108±3db S.P.L(at 1KHz) 5) Microphone sensitivity:-58 ±3dB 6) Microphone Directivity:Omni Direction 7) Socket: ?2.5mm nickel 8) Cord: 1.0m PVC cord 9) Color: black Packing: 1pc/ PE bags, 500pcs/ctn, ctn meas: 48*35*16cm