Product parameters 
1. Model: MD04
2. Style: Bone Conduction Headsets
3. Bluetooth Version: 5.0
4. Bluetooth Distance: 10m
5. Speaker: Bone Conduction Technology Speaker
6. Frequency: 20Hz-20KHz
7. Microphone Sensitivity: -42db
8. Battery: 180mAh polymer lithium battery
9. Listening Time: 20 hours
10. Talk Time: 15 hours
11. Charging Time: around 30 minutes
12. Standby Time: 300 hours
13. Waterproof: IPX5
14. Weight: 18g
Package list:
1 * Bluetooth headset 
1 * Charging Cable 
1 * User Manual