HIFI sound quality and metal cavity let you entirely devote yourself in the music world. Convenient line control and one-key flexible switching, giving you more convenient experience. Lightweight and handy, easy to take and wear even without noticing it. Compatible with most 3.5mm music players, including smartphones, tablets, and other audio players. Receive Sensitivity: 91dB+3dB Frequency Response Range:20-20000Hz Plug Diameter:3.5mm