DLAND Convenient Detachable Stereo 3.5mm Plug Music Headphone Headset with Microphone for Iphone, Samsung,Huawei,OPPO Android phone calls and computer(Red) Ear cavity 40mm hi fi speaker unit, tri band perfect equilibrium bring carefree quality experience, handmade headset Piston type wire with calls and music playback and other functions. Upward movement: Volume+, Downward movement: Volume- Unique removable auricular design, let the auricular free disassembly and assembly, convenient portability, convenient storage The head internal scale adjustment, jagged obvious, not easy to fall to the auricular: the most suitable position according to personal head adjustment