User manual SONY MDR-NC11A

[. . . ] Newly developed Sony acoustic circuit provides clear sound and efficient noise attenuation. â· Neodymium magnets are used to deliver powerful sound. â· Monitor switch is available to deactivate noise canceling circuit and hear outer ambient sound. [. . . ] â· Operates as passive heaphone when noise canceling circuit is not activated. 1Turn the ear plug sidewards and put it in your ear so that the cord is placed behind your neck. 2Turn the ear plug vertically, then put it firmly in your ear. If you have any questions or problems concerning the system that are not covered in this manual, please consult the nearest Sony dealer. When carrying the headphones After listening to music Turn off the power of the headphones. The noise canceling function is only effective for noise in the low frequency band. Although noise is reduced, it is not canceled completely. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. You are cautioned that any changes or modifications not expressly approved in this manual could void your authority to operate this equipment. power switch is located on the battery box. When power is turned on, ambient noise is reduced, and you can listen to music more clearly at a lower volume. Hours 60 hours The noise canceling function may not work properly unless the headphones are put on firmly. â· You can use the headphones even without turning on the power. In this case, the noise canceling function is not active, and the headphones operate as passive headphones. [. . . ] â· You can use the headphones even without turning on the power. In this case, the noise canceling function is not active, and the headphones operate as passive headphones. Hearing experts advise against continuous, loud and extended play. [. . . ]