Sports waterproof. 4. Support A2DP, AVRCP, HFP, HSP, SPP, PBAP. 5. Support master-slave switching, 6. Ultra-low power consumption, 7. Dynamic coil unit, the bass is thick and powerful, and the mid-high frequency is clear and bright. 8. Seiko battery protection board, support 0V charging start. 9. Ultra-low standby current.