Mixcder E9 is a noise cancelling headphone, it adopts active noise cancellation technology, which can effectively shield ambient noise so that you can have a quieter listening environment. And it uses a leading Bluetooth module to make the connection faster. Let you completely get rid of the trouble caused by cables. Combined with adjustable headband and ultra-soft leather earmuffs, it comfortable to wear without burden. The built-in rechargeable battery can be played continuously for 30 hours per charge. Its free aeroplane adapter allows us to enjoy music without any hindrance.