My headphone keeps making this plastic cracking sound when I turn my head left and right. Button control is suck. Build quality is cheap plastic. Comfort level is good. No bass at all on stock sound profile. I have to download the app to put the bass boost mode on. Even with bass boost mode enable, I can still heard sound distortion on medium sound volume. Sound volume is low like I have to crank it up to 70% - 80% volume. Decent passive noise.cancellation. I am thinking of returning this unit for a refund. Did not meet my expectation especially the sound volume department. Save your money and get something that has good sound volume at 50% volume.