Used. Listen to your favorite music without interference and with the best comfort with wireless Bose QuietComfort 45-round-ear headphones. Any environment becomes an ideal listening mode thanks to Acoustic Noise Cancelling technology and Aware mode. Enjoy music for up to 24 hours with one charge in full comfort thanks to light and well-designed design.Acoustic Noise Cancelling TechnologyEnjoy comprehensive noise removal and better listening experience. Microphones mounted on earcups follow everything you hear, including extra noise. The extra noise is removed by an opposite signal. Due to the noise of the reduced environment, the excellent sound quality of the headphones is increasingly heard. You can hear details in your favorite songs that you never noticed before.Aware Mode modeAware mode The microphones capture the surrounding sounds and repeat it naturally in headphones along with music so that you can follow the events of the environment while listening to your favorite music.Quality Bose soundEnjoy crystal clear and top quality sound quality with a balanced bass Thanks to unique Bose technologies, such as the acoustic TriPort architecture and Volume-optimized Active EQ technology, which offer uniform sound quality and comfort at the same time.Excellent comfort is important when listening for longer periods of time, and Bose has made sure that the headphones are as comfortable as possible. Smooth paddings without a knife, soft synthetic leather and minimal compressive force ensure that the headphones feel almost unweighted. Clear soundHear the external microphone as well as noise-removal algorithms that remove external noise and noise noise from calls, ensuring excellent sound quality.24 hours of listening timeListen to music up to 24 hours in one. charge. You can continue listening all day and recharge the battery in just 2.5 hours, or get 2.5 hours extra time with just 15 minutes of instant charge.Buying is an environmentally friendly choice!All of our products are covered by a 14-day return policy under the Consumer Protection Act.