Replacing the ear tips
When purchased, the M size ear tips are attached to the earphones.
If they do not fit well in your ears due to the size of the ear tips, replace them with the supplied ear tips (S/L sizes).
If you use ear tips other than those included, the earphones may not fit into the charging case, or may not charge. Be sure to use the included ear tips.
Hold the ear tip and pull while tilting it.
Align the nozzle with the ear tip attachment part and push it all the way in using a small amount of force.