Drive unit:8mm Frequency response:20-20khz Sensitivity:106db¡à3db Impedance:16 ohm Rated power: 2mw Jack:diameter 3.5mm Packaging information Sales packaging: color box/ blister+card, etc Transport packaging: (if blister and card) Pcs per carton: 120 pcs Size of cartone: 65*51*60cm Gross weight: 9¡à 0.2kg