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Bluetooth Version : 5.0 Driver Size : 40mm Impedance : 32ohm Sensitivity : 19db Frequency Response : 20hz - 20khz Wireless Operating Range : Up To 15m Built In Rechargeable Battery : 200mah Lithium Polymer Battery : A Level With Protective Plate Working Time : Up To 10 Hours At 70% Volume Standby Time : Approx. 200 Hours Charging Time : 2..