Bluetooth version: 5.0 
Bluetooth distance: 20 meters ( in barrier-free environment)  
Talk time: 4 hours 
Battery capacity: 3.7V 35mAx2 + 1200mAh 
Headphone charging time: 2 hours 
Frequency response range: 20Hz-20KHz 
Bluetooth decoding format: SBC AAC 
Bluetooth protocol: A2DP/AVRCP/HFP/HSP/SPP/PBAP 
Waterproof: IPX5

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