OPPO O-Fresh Stereo Earphone with 3.5mm Jack (Black)

High Resolution Sound Quality Certified by Hi-Res Graphene Vibrating Diaphragm Sound Field Enhancement Technology Geometric Aesthetics Design
O-fresh, just to make its sound well-balanced between clear treble, outstanding alto and powerful bass. Enjoy your groove with o-fresh
The 11-mm moving coil loudspeaker, made with graphene diaphragm and the copper clad aluminium voice coil from daikoku japan, not only effectively expands the bandwidth to 20hz-40khz