Noise canceling headphones reduce ambient noise, and provide a quieter environment to enhance audio entertainment. Ambient sound is synthesized with an anti-sound signal produced by the noise canceling circuit, and reduced.. Plug adapter is included to connect directly to stereo or to the dual jack of in-flight music services.. Operates as passive headphones when noise canceling feature is not activated.. Foldable design to provide storage and portable convenience.. High quality sound with closed type stereo headphones featuring large 30mm drivers and full size ear cups.. Driver units: 2 x 30mm. Noise reduction level: 15 dB at 300Hz. Output power: 7.8mW. Power requirement: DC 1.5V, 1 x AAA battery