Mobile earphones /mobile handsfree earphones Specification: Drive unit: ¡é15mm Frequency response: 20-20khz Sensitivity: 107db¡à3db Impedance: 32 ohm Rated power: 3mw Condenser Sensitivity: -58db¡à3db Polar pattern: omni-directional Frequency response: 100-16000hz Impedance: 2.2k ohm Jack: diameter 10pin. Plastic bag packing 600pcs/a carton Carton size:37*30*20cm.