Specifications:

Bluetooth Version: 4.1
Bluetooth Chipset: Airoha
Input: 37V
Output: 5V 2A
Speaker Frequency: 50Hz ~ 20KHz
Charging Time: 1-2 hours
Playing Time: 3 hours
Headset Battery Capacity: 40mAh x 2
Charging Case Battery Capacity: 5000mAh