Moki Noise Cancellation Headphones use the latest in Active Noise Cancelling technology to reduce the influence of surrounding ambient noise and help block external distractions. The ideal headphone for those who frequently travel in noisy environments. Key Features which includes Active Noise Cancellation - 17dB |  Pack Includes - removeable standard, cable, removeable mic’d cable, travel pouch and 2 airline adaptors | ANC requires 2 AAA batteries to operate (4 batteries included) | Perfect for noise environments | Suitable for use with all 3.5mm audio devices |