beyerdynamic Custom Street Headphones, Black Custom Sound Slider with the ability to change the sound anytime (closed, semi open, open design).Connectivity Technology: Wired Includes detachable single button remote control with high quality microphone 32 ohm impedance for max volume with all portable players and smartphones Closed Design for perfect isolation and includes hard carry case for easy storage 2 year manufacturer warranty only when purchased from an authorized beyerdynamic dealer