Sony Premium Lightweight Extra Bass Earbud Headphones with In-line Microphone and Remote for Android Smartphone (Blue) 12mm Drivers - Specially designed drivers with high-energy neodymium magnets deliver deep, powerful bass that perfectly complements today's popular music genres Extra Bass Design - A tightly sealed acoustic design allows for a high level of sound isolation which aides in the reproduction of powerful and extended bass response In-Line Mic & Remote - The integrated microphone and multi-function control button make the Sony earbuds the perfect companion for your smartphone Sony Smart Key App Compatible - Android users can also enjoy the convenient Smart Key app for added control functionality directly from your smartphone Comfortable fit - Hybrid silicone earbuds provide long lasting comfort and designed to reduce ambient noise; x-small, small, medium and large earbuds are included to fine tune your fitment