Audio-Technica ATH-CKS990iS Solid Bass In-Ear Headphones with In-line Microphone & Control 13 mm Dual Magnetic-Field Drivers feature Multiple-Transition Diaphragms with a diamond-like carbon coating to deliver powerful yet refined bass. Connectivity Technology: Wired Dual Bass Venting System optimizes air damping for excellent bass reproduction Machined aluminum housings contribute to extended mid-high frequency response Separate star-quad cables for left and right channels improve isolation from external noise and channel cross talk In-line control with mic to answer/end calls and control music & video playback on smartphones and other portable devices