The Apple-designed H2 chip pushes advanced audio performance even further, resulting in smarter noise cancellation and more immersive sound. The low-distortion, custom-built driver delivers crisp, clear high notes and deep, rich bass in stunning definition. So every sound is more vivid than ever..Note : If the size of the earbud tips does not match the size of your ear canals or the headset is not worn properly in your ears, you may not obtain the correct sound qualities or call performance. Change the earbud tips to ones that fit more snugly in your ear