UiiSii C100 Earphones In-ear Earbuds Headphones with Microphone (Black) EXCELLENT SOUND QUALITY: High Performance & stereo sound, treble and clarity, which allows you to have a better listening experience. The 3.5mm audio jack is for premium connection to any devices like android, iphone and window devices. BUILT-IN MICROPHONE: remote button is for answering | hang up calls | turn on | turn off | the previous track / next track of the music. The N/S switch is designed for compatibility to any devices. You can find the suitable compatibility by switching the N/S switch. COMFORTABLE WEARING: The ergonomic design provides wearing comforts. 2 ultra-soft silicone ear cushions make it available to various ear structures. The lightweight headphones also provide the extra portability and comforts when in usage. 3.9ft WIRE: provides extra flexibility and convenience, which can be easily threaded through a jacket or placed in a bag or backpack when needed. This allows you to have more convenience in your daily usage, like working and traveling. 6 MONTHS WARRANTY: offers excellent customer service to our customer. Please feel free to contact us if you have questions. We are happy to resolve any questions and your satisfaction is our final goal! Contact us if needed.