Fourcase Bluetooth Headphone/Earphones/Eaubuds/Headset Wired with Microphone & Remote Control Noise Canceling Sweatproof Compatible IP XS/XR/ XS Mas,IP 7/8/X/7 Plus/8 Plus How to Use Earbuds As this earphone is a Bluetooth connectivity version .You need to open the Bluetooth on your Phone ,connect your earphone with your Phone, and click the Earphone on the other devices on your Bluetooth interface manually .(It will connect automatically the next time when you connect your earphone with your Phone in few seconds If your Bluetooth is open ) Volume ControlThe cord was built in a in-line controller and a high quality hands-free microphone, the controller was designed to play / pause music / next track / previous track / answer phone calls / hang up phone calls. High performance sound qualitySuper dynamic deep bass high resolution treble & crisp powerful sound. It has perfect stereo sound quality, enjoy full listening comfort with soft, bring you the perfect audio enjoyment. Ergonomic designUniversal headset shape match most people's ears.Ergonomic design allows for ultimate wearing comfort,you wont feel hurt even for an whole day wearing. STRONG COMPATIBLE Compatible with most Bluetooth enabled devices, such as IP iP XS/ XR/ XS Mas,IP 7/8/X/7Plus/8Plus and more upgrade version.