Usually the problem with earphones is that you don't know which goes to which ear. Of course there are some small markings (such as L or R), but who wants to read those every time when you want to use them (especially in some dark places).
Which method usually do you use to keep the track which one is which?
In lighted situations: Wrap electrical tape around the base of the earbud and the wire, using a different color for each side. I would suggest red for right just for the mnemonic device. Taping is good practice, anyway, unless your wires are fabric-wrapped.
In dark situations: Put a drop of high-temperature glue - super glue is probably OK - on the outside stem or shell of one of the earbuds and let it dry completely. You'll be able to feel the bump with your fingertip.
A dot of red fingernail polish on the right earbud. Red and Right begin with the same letter.
You can make a simple knot on one of the earphone cable, so from know you'll always know which headphone is the left one, even without looking.
Wrap some tape around one of the cables. Make it thick enough to feel or make a tab.
Most earphones have a long and short cable. You could remember which way you wear them.
I know that my Sennheiser earphones are short on the left side and long on the right side. I always put them on in the same way, the long wire goes behind my neck towards my right ear, whilst the left side can easily be inserted.
Hi I am using Samsung earphones and on the left earphone, there is a dot which can befelt in dark. Also for Left earphone L is not carved in its carved out, which can be felt in dark along with a dot just below that. Guess this solves the purpose.
My solutions
In light: I took a permanent marker and covered the right earbud with one color (blue) and the left with another (red). If you have earbuds with colors other than white, wrap paper and tape it around each earbud cable and then do the coloring.
In dark: I took some tape and made a little "flag" on the right earbud.
