There is two method:
1. Old credit card (or plastic card) cutted to wrap the cord around.
2. Wrap your cord around your hand and do a knot.
Step 1: 1. Plastic Card Method
1. Cut the card in half.
2.cut 2 angled line like on the picture(look on the fifth one).
3.Cut an hole at the end of the line (on the both lines) .
4 . Try it.
Let's try the second method...
Step 2: 2. Hand Knot Method
1. Wrap the cord around your hand, with the earphone in your hand.