1. Speaker Specifications: outer diameter 40mm/32Ω20mW

2. Rated Power of Headphone: 20mW*2 (series resistance, if not series resistance, it can reach up to 30mW*2)

3. Degree of Separation: ≥40dB

4. Working Hours for Outside Sound: ≥6 H Under 50% of volume

5. Distortion: ≤1%

6. Working Hours of Headphone: no limits

7. Polymer Lithium-ion Battery: 3.7V/350mAh, decrease to 85% of capacity after 300 time charging and discharging 

8. Charging Voltage: USB port DC-5V, I≥500mA

9. Charging hours: ≤2.5H

10. Applicable Device: MP3/MP4 players/Apple IPAD, iPhone 3, 3GS, 4, 5, 6, PC

11. Frequency response: 100-20,000Hz

12. Audio Input Port: 3.5 stereo sound port

13. BT Solution CSR: V4.0

14. BT distance: <10 meters

15. Microphone: -43 ±3dB

16. Color: Black/Red/Blue/White