UiiSii BN80 Wireless Bluetooth Headset Dynamic Earbud In-Ear Earphone 250mAh Battery IPX5 Waterproof CSR BT4.1 Earphone

1 The magnetic design of the back cavity of the ear shell makes the movement more convenient.  
2 CSR8640 imported chips, signal transmission is more stable.  
3 250mAh large battery is twice the power of the market sports bluetooth headset