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Brand:OKCSCNo.: i8sHeadphone battery capacity: 50 mAhStorage box battery capacity: 1000 mAhCharging time: 30 minutes Bluetooth version: 4.2 (network up to 1526)Speaker: ?10mm * 2 Hi-Fi stereoBluetooth distance: 10 meters Headset playback time: 180 minutes / 0.09Wh Frequency: 2402MHz-2480MHzVoltage: 3.7V Impedance ohm value: 32Headphone battery output W: 0.09WStorage box charging times: 10 timesControl mode: touch control Receiver sensitivity: -94dBMicrophone: -42dB MEMS MicrophoneFrequency: 20Hz-20KHz