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SonicGear ANC3000 Active Noise Cancelling Foldable Bluetooth Headphone Features: Bluetooth Version : V5.0 + EDR Driver Size : 40mm Impedance : 32 Rated Power : 25mW Frequency Response : 20Hz-20,000Hz Active Noise Cancellation : Noise Reduction Specification : 6 x 2.2mm Noise Reduction Frequency Range : 40Hz-600Hz Max Noise Reduction Level : 22dB +..