10.How to distinguish the left and right channels of the FH5s?

Left/L: blue Right/R: red
The FH5s has unit markers on each of its earphone units- blue for Left/L and red for right/R.

Other than the letter marker(L and R) at the MMCX connector, there are corresponding colors- blue for Left/L and red for right/R. Please distinguish the left and right sides based on the markers when changing the cable.