noise canceling headphone is with both active and passive noise reduction function, in comfortable bigger design

 noise canceling 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, etc4. Noise Cancelling and Common Wired Headphone available5. Driver Unit: 40mm Dynamic Speakers6. Impedance : 32Ω±10%7. Frequency Response : 20Hz - 20K Hz8. Reduction level:>18dB at 300Hz9. Sensitivity: 108dB at 300Hz10. Plug: 3.5mm stereo Plug11. Power Requirement: one battery (Not included)

 Noise cancelling earphone  features (for JH-301B):1) Active noise cancelling technology to enhance the power of noise filtering2) Block the external noise to offer a superb listening experience3) Foldable design, convenient for traveling users, especially for listening to car audio devices (portable DVD, GPS)4) Driver unit: 40mm dynamic speaker5) Impedance: 32Ω±10%6) Frequency response: 20Hz-20kHz7) Active cancellation: 20-1,000Hz8) Sensitivity: 102dB at 300Hz9) Max input power: 200mW10) Cord length: 1.5m11) Plug: 3.5mm stereo plug12) Power requirement: DC 3V, 2 AAA batteries

Noise cancelling earphone  features (for JH-303B):

* Active Noise Cancelling technology to enhance the power of noise filtering.* Block the external noise to offer a superb listening experience.* Active reduction level:>19dB at 300Hz                       

* Driver Unit: 40mm Dynamic Speakers  * Impedance : 32 ohm ±10%                                                 

* Frequency Reponse : 20Hz - 20KHz                              

* Sensitivity: >105dB at 1000Hz                 

* packing detail:                                                       

giftbox size: 16.5*8*19CMmeas of carton: 42*34*40.5CM   20pcs/ctn  G.W.: 5.5KGS

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