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About this itemModel number: WS-538BTBT version: V4.1BT range: Up to 10metersBattery: 1200mAh / 5VAudio output: 5Wstereo speakerAux input: 3.5mmRange of Frequency: 60-20KHZSignal-Noise Ratio: ≥80dBFunctions: BT/USB/TF/AUX/FMCharging time: 2-3HPlaying time: 90-130minutesAccessories: USB cable,  ..