Summarizing how Quietcomfort 3 headphone functions

Conclusion

First of all, before started using the Quietcomfort 3 headphones, the user must charge the battery within approximately two hours. To charge the battery, insert the battery into the charger; swing the plug prongs out of the charger body and the plug charger into a live AC (main) outlet. As the charging completes, the charger must be unplugged and the battery removed. This is to prevent the capacity of the battery to be permanently reduced. After that, the user must install the battery into the headphones. While inserting the battery, the headphones must be in switch off mode. The user may use the headphones only for noise reduction or for listening to audio along with noise reduction. For listening to an audio source, the user must plug the headphones cords connected to the dual jack adapter into any variety of audio devices or the airline audio systems.