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Bluetooth 5.0 Lightweight design Comfortable Bluetooth headset for casual sports Built-in AUX input : 3.5mm stereo jack Built-in Rechargeable Battery Headphone specifications: - Speaker Size : 40mm - Frequency Responce : 20HZ -20KHZ - Max. Input Power : 20MW - Built-In Aux Input : 3.5mm Stereo Jack - Impedance : 32ohm - Sensitivity : 96 + - 3 D..