... inremote control, and so on. -Key function: last songs, next songs, volume control, Play/pause, repeatProduct No.: SW-921 ... amplifier, electronic products and so on.-Key function: last songs, next songs, volume control, Play/pause, repeatOEM & ODM ServiceODM & ... Staff: 51-100,including around 5 R&D StaffProduct Line: mini Card& USB reader speaker, portable FM radio speaker, mobile speaker, ...