Acrylic

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Frequency range: 20-20KHZSensitivity: 95dBTransmission distance: 10mCharging time: 2HListening to the call duration: 3-6HBattery: 180mA polymer lithium batteryProduct packaging: baseball cap + data cable + manualBluetooth protocol: 4.2Bluetooth name: BT-01Product size: 22.5*21.5cmProduct features: Bluetooth can...