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Anc-780 noise canceling headphones Driver unit: 40mm Frequency range: 20hz-20khz Impedance: 50ohms M.P.O.: 120mw Noise reduction: 70hz-1.2khz T.H.D.:0.05%-1% Power: aaa*2 Batterh life: 60 hours Plug type: 3.5mm. Packing : 20pcs/ctn
