FiiO F9 PRO Triple Driver Hybrid In Ear Headphone Monitor with Mic and Remote - Titanium<br>The F9 PRO is utilizing the detachable cable design.  Before installing cables, please make sure the Left and Right earphone units (marked with "L" or "R") match with the corresponding cable; When installing the cable, hold the cable connector and earphone unit tight with your fingers, keep them on the same line and push them hard against each other until you hear a "click" sound; When removing the cable, hold the cable connector and earphone unit tight with your fingers, keep them on the same line and then pull them apart.