Bose QuietComfort 2 Owner's guide - Page 6

Using the adapter plugs To connect to in-flight entertainment systems equipped with dual output connectors, use the dual 3.5 mm output plug. English Storing the headphones To store the headphones in the case, rotate the earcups inward, then place the headphones in the case. Note: If you find that the volume level is too low, remove the adaptor plug and plug the headphone directly into the 3.5 mm output connector. To connect to an audio device that has a ¼ in (6.3 mm) stereo output connector, use the stereo adapter plug. CAUTION: Incorrectly rotating the earcups can damage the headphones. 4