Noise Canceling Headphone

noisecanceling headphone features: JH-304B 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: 40mm Dynamic Speakers 6. Impedance : 32Ω±10% 7. Frequency Response : 20Hz - 20K Hz 8. Reduction level:>18dB at 300Hz 9. Sensitivity: 108dB at 300Hz 10. Plug: 3.5mm stereo Plug 11. Power Requirement: one battery (Not included)