1. Support Bluetooth, SD card (not included), 3.5mm AUX cable (not included) to play music 
2. The head beam can be telescopically adjusted, suitable for head circumferences of different sizes 
3. Leather earmuffs, soft and comfortable to wear 
4. Foldable for easy storage 
5. With storage box 

Product Specifications: 
1. Chip: Jerry AC6955F 
2. Bluetooth version: 5.0 
3. Transmission distance: about 10m 
4. Frequency response: 20-20KHz 
5. Speaker sensitivity: 110dB+/-3dB (at 1KHz/0.178V) 
6. Speaker specifications: 40mm 19U 32 ohms 
7. Rated power: 10mW 
8. Power: 20mW (max) 
9. Battery specification: 300mAh 
10. Playing time: about 6 hours 
11. Charging time: about 2 hours 
12. Microphone sensitivity: -42+/-3dB 
13. Charging requirements: DC 5V-100mA 
14. Bluetooth protocol: A2DP1.3, ACRCP1.5, HFP1.5, SSP1.2, HSP1.2 
15. Charging interface: Micro USB