User manual SONY MDR-NC6

[. . . ] Put on the headphones so that the ear pads cover your ears. To prevent fire or shock hazard, do not expose the unit to rain or moisture. [. . . ] In this case, the noise cancelling function is not active, and the headphones operate as passive headphones. Hours *1 30 hours *2 15 hours *2 Listening to music 1 What is noise cancelling?The noise cancelling circuit actually senses outside noise with built-in microphones and sends an equal-but-opposite cancelling signal to the headphones. â· The noise cancelling effect may not be pronounced in a very quiet environment, or some noise may be heard. When you turn the POWER switch on, the operation sound of the noise cancelling may be noticeable. â· The noise cancelling function is only effective for noise in the low frequency band. Although noise is reduced, it is not cancelled completely. â· When you use the headphones in a train or a car, noise may occur depending on street conditions. When to replace the battery Replace the battery with a new one when the POWER indicator dims. The noise cancelling feature may not work correctly if battery power is low. Listening to music 1 Clean the headphones with a soft dry cloth. â· Do not leave the plug dirty otherwise the sound may be distorted. [. . . ] ** May not be compatible with some in-flight music services. When the power is turned on, ambient noise is reduced, and you can listen to music more clearly at a lower volume. [. . . ]