Communications: Bluetooth 5.0 BT profiles: HFP, HSP, SPP, A2DP, AVRCP Range: up to 10 m Frequency: 20 Hz - 20 kHz Built-in battery: 2200 mAh docking station, 45mAh headphones Charging Time :. Docking stations approximately 2.5 hours, headphones approximately 1.5 hours. Duration: about 4 hours Impedance: 32 ohms
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