User manual BOSE QUIETCOMFORT 2 HEADPHONES

[. . . ] It is best to avoid extreme volume when using these headphones, especially for extended periods. CAUTIONS · Do not use these headphones when operating a motor vehicle on a public road, or where the inability to hear outside sounds may present a danger to the user or others. · Sounds that you rely on as reminders or warnings may have an unfamiliar character when you are using the headphones. [. . . ] L LO Typically used for airline audio systems or audio devices that use A/C power. HI Typically used for battery-powered audio devices (CD/DVD or MP3/ digital audio players) and personal computers. Headphones cord Note: The HI and LO settings have no affect on noise reduction. Refer to "Connecting to portable and home audio devices" on page 5. Use the volume control on your audio source to make further volume adjustments. For noise reduction only If you plan to use them for noise reduction only, simply put on the headphones and turn on the power switch, located on the right earcup. The headphones cord is not required. 4 Using Your Headphones Connecting to portable and home audio devices The 3. 5 mm plug on the headphones cord allows you to connect your headphones to a variety of audio devices that use a single 3. 5 mm output jack such as a CD, DVD, MP3/digtal audio player, or personal computer. Set the LEVEL switch to HI and plug the headphones cord directly into the 3. 5 mm output jack. To connect to a home stereo system that has a ¼ in (6. 3 mm) stereo output jack, use the the ¼ in (6. 3 mm) stereo adapter plug included with your headphones. Plug the headphones cord into the adapter plug and insert it into the output jack on your stereo system. English English Connecting to airline audio systems The audio output connections on airline audio systems vary, but they typically have dual or single 3. 5 mm output jacks. Note: Airline audio may not equal the high quality audio you experience from a home stereo or portable source. Plug the headphone cord into the dual-plug adapter and insert it into the dual output jacks. Plug the headphone cord into the adapter and insert it into the single output jack. The LO setting of the LEVEL switch lowers the volume levels of strong audio output signals which are common on airline systems. If you find that the volume level is too low, set the LEVEL switch to HI. 5 Care and Maintenance English English Folding the earcups for storage QuietComfort 2 Acoustic Noise Cancelling headphones feature rotating earcups that fold flat for easy, convenient storage. The earcups rotate in one direction only. ® ® L R CAUTION: Incorrectly rotating the earcups can damage the headphones. Reattaching earcup cushions The earcup cushions are held in place by a mounting flange. This flange snaps under small tabs located around the inside rim of the earcup. If an earcup cushion becomes partially or completely detached, push its mounting flange back into the earcup. Then use your finger or thumb to press around the edge of the mounting flange, making sure it snaps into place all the way around the earcup. 6 Care and Maintenance Battery replacement Although it varies by usage, battery life averages 35 hours. With the headphones turned on, the battery light indicator will flash when there are approximately 8 hours of battery life remaining. [. . . ] For pilots, Bose offers a communication headset which is specifically designed to meet or exceed civil authority standards. It features a microphone with the appropriate power and intelligibility for transmission of flight information. It is also engineered to withstand the altitude and temperature conditions that are common in non-commercial aircraft. [. . . ]