No matter where and when. you&apos. Ll always be sure to have your HD 218i along for the ride. Its full sound and dynamic bass reproduction keep you going. all day. every day. The closed. supra-aural acoustics screen out surrounding noise - the clatter of the train or the chatter of people sitting next to you - so you can immerse yourself in the excellent bass-driven Sennheiser stereo sound. When a call comes in. take it using the smart in-line remote control with microphone. It&apos. S been especially developed for use with Apple devices. like the latest generations of iPod. iPhone and iPad. You can control the volume. answer and end calls. use the iPhone Voice Control function and browse and play your music all from a sleek unit located directly on the cord.