The L！ / Earphone

The sounds are recorded into left channel and right channel separately, so there are differences between L and R earphones.
People need to give a glance at the earphones to confirm the L or R before they put the earphones into their ears. Sometimes, people need to recheck the L and R earphones after they put them into the wrong ears.
So we design a bump upon the left earphone to enable the users to easily differentiate them by touching.
A blind user can easily figure out which one is the left earphone by touching the bump.
A user can find the left earphone on the table by a simple touch when it is barely visible on night.