Relax in silence or enjoy music & tv like never before These stylish & comfortable to wear noise reduction headphones can reduce ambient noise by up to 85%, allowing you to enjoy music & televison with sound & clarity you will not believe. Alternatively if you wish to enjoy the tranquility of silence, whether it's to relaz or when travelling these headphones can remove crowd or traffic noise to provide a calming & distraction free environment. The Zennox noise cancelling headphones also include a 'hear around you' button that means that you can switch to ambient noise & amplifly it through the headphones, enabling you to hear important announcements or take part in conversation without removing the headset. Featuring an on-ear design for an undisturbed listening experience, the headphones are powered by a single AAA Battery (not included)