noise canceling headphone features:  JH-303B

1. Active Noise Cancelling technology to enhance the power of noise filtering

2. Block the external noise to offer a superb listening experience

3. Suitable for users in noisy environment like subway, airline, highway, etc

4. Noise Cancelling and Common Wired Headphone available

5. Driver Unit: 30mm Dynamic Speakers

6. Impedance : 32Ω±10%

7. Frequency Response : 20Hz - 20K Hz

8. Reduction level:>14dB at 300Hz

9. Sensitivity: 102dB at 300Hz

10. Cord Length: 1.2m

11. Plug: 3.5mm stereo Plug

12. Power Requirement: 2  batteries (Not included)