Sennheiser HD 471i Headset with Inline Mic and 3 Button Control Closed-back, around ear design helps block ambient noise. Connectivity Technology: Wired Ergonomic design delivers a comfortable fit for long listening sessions Detachable, single-side cable with in-line 3-button remote provides improved freedom of movement and user convenience In line 3-button remote provides music and call control for Apple (iOS) devices 2 year warranty when purchased from an authorized Sennheiser dealer