Ovleng MX666 Wireless Bluetooth V4.1 EDR Stereo Rechargeable Headphones
1. Bluetooth version: 4.1
2. Bluetooth distance: 10m max
3. Battery Volume: 300mAh
4. Charging voltage: DC 5V
5. Working time: Music 4-6h, Call 8-10h
8. Microphone: built-in
9. Power rating: 100mw
10. Working voltage: DC 3.7V
11. Sensitivity: 20 Hz- 20 KHz
12. Adjustable structure for different needs