* The 2 loudspeakers next to your ears give you clear stereo sound and avoid noises caused by the wind.* With HD microphone and hands-free function, it can truly free your hands.* 3.5mm gold-plated plug makes it widely compatible with smart devices with 3.5mm port.* High-quality earphone cable is durable and resistant to tension.* With line control function, three operation buttons allow you to adjust volume, play or pause songs and receive calls.