550 FireCord 25ft Thin Red Line High performance sound quality with super dynamic deep bass high resolution treble & crisp powerful sound. It has perfect stereo sound quality, enjoy full listening comfort with soft, snug ear buds that conform to your ears, bring you the perfect audio enjoyment. Ergonomic and ultra-lightweight in-ear designed with solid sound-insulating material, reduces external noise while minimizing the sound leakage, giving you clear sound. The cord was built in a in-line controller and a high quality microphone, the controller was designed to play / pause music / next track / previous track / answer phone calls / hang up phone calls. Compatible with IOS and Android System,perfect phone earphone. phone 8 /8 plus /7 Plus / 7 / 6s Plus / 6s / 6 Plus / 6 / 5s / 5c / 5 / Samsung S8 /S7/ iPad Pro / iPad Air / Air 2 / iPad mini / mini 2 / mini 4 / iPad 4th gen / iPod Touch 5th gen / iPod nano 7th gen/Tablet PC If you have any question, please feel free to contact us. Our service team will reply you with satisfied solution within 24 hours.