Xiaomi Mi HiFi Headphone 50MM Beryllium Diaphragm Stereo Earphone With Microphone - Black Color All about that bass: Massive 50mm diaphragm, incredible sensitivity. At the heart of Mi Headphones lies an acoustic system supported by a large 50mm diaphragm that's 4 times harder than steel and 60% lighter than titanium alloy. It produces a quality of sound found only in high-end audio systems and has the ability to retain a natural sound with minimal distortion and coloration, even at the highest ranges. A concert hall experience: Semi-open design for true sound representation. 3D sound produces a realistic listening experience that distinguishes melodies in a symphony. The semi-open design reduces distortion and improves fidelity with a dual damping system absorbs internally-reflected sound waves. Hear and be heard: Built-in Knowles microphone / Kevlar fiber cables. The built-in Knowles MEMS microphone provies excellent audio clarity for calls, supported by a silver-plated copper wire that doesn't cut off at the remote, but runs right through it to ensure an optimal signal transmission. The independent stereo channels are separated from the microphone line, minimizing interference and preserving the purest sound quality during calls. Speaks volumes: 32-ohm low impedance. Turn it up. The 32-ohm low impedance allows for higher audio levels while running on less power. Built with mobile compatibility in mind, Mi Headphones work great especially when you're plugged into your phone and on the go. Play by ear: Comes with three replaceable on-ear and over-ear cushion kits Comes in three different ear cushion kits that can be used interchangeably to reduce sound leakage and insulate against ambient noise. Twist off and snap on, depending on which size suits you best. On-ear cushions are great for outdoor use, while over-ear cushions provide maximum comfort.