[ Active Noise Reduction ] Wired Stereo Headset, Music Headphone. A great headset for Music: Built-in ANX noise reduction technology, effectively reduce 85% background noise. Create Amazing listening environment, you'll quickly lose yourself in the soundtrack of your day. Light wight design, Super comfortable, suitable for long time use, especially in noisy office. Good companion for travelling. Powered by 3*AAA batteries(not included), also can be used as normal stereo headphone after power off, easy to listen to and use. Adaptable Audio: Cooperate with MP3,CD, DVD player and cabin entertainment system. Notice: Please turn the power switch off if no battery in the headset. Please keep the MUTE switch to turn off state.