Features ：
1） Master and slave earphone interchange available
2） Can used as power bank
3） Wireless charging available
4） Waterpfoof IPX7
Colors: Black/White
Earphone battery: 40mAh
Storage box battery: 2200mAh
Bluetooth Version: V5.0
Chipset: Realtek or Airoha available
Talking Time: 3-4 Hours
Number is must
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