Detailed introduction

* Correspond With: Bluetooth V5.3 AC7003D8
* Working hours: 4.0Hours (60% Volum) 
* Total working hours: 20 Hours
* Charge time: 1.0 Hours
* Bluetooth range: 10m
* Battery: 30mAh*2
* Speaker type: Φ13.0mm
* Built-in lithium battery: 300mAh
* ANC Depth: >20db  
* Charging Box size: L48.5*W25.2*H52mm