Troubleshooting - Why there is a small bump on my left earbud and not the right one? - Technics and Panasonic Earphones

This bump is to distinguish between the right and left earbud. There is no manufacturing error, this is to indicate to you that the earbud that has a bump on itis the left earbud.

This FAQ applies to models RZ-S300, RZ-S500, EAH-AZ40, EAH-AZ60, EAH-AZ70.