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• Bluetooth Version : Bluetooth V5.0 • Working distance : About 10meters • Battery : Lithium polymer 3.7V 200mAh • Speaker : 40mm 19Ω*2 • Frequency response :90Hz-20kHz • S/N ratio : ≥60db • Charging time : 2hours • Continuous working time : 80% volume for more than 4hours. • Built-in Mic..