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*Bluetooth Version : V5.0 + EDR *Driver Size : 40mm *Impedance : 32 *Rated Power : 25mW *Frequency Response : 20Hz-20,000Hz *Noise Reduction Specification : 6 x 2.2mm *Noise Reduction Frequency Range : 40Hz-600Hz *Max Noise Reduction Level : 22dB +/- 2dB *Noise Reduction Central Frequency : 100Hz-300Hz *Built in Recharagable Battery : 400mAh Working Time ANC On : UP to 15 Hours *Working Time ANC Off : UP to 24 Hours *Standy Time : Approx 100 Hours *Charging Time : 3 Hours