Sennheiser ConC 400 Series Instruction Manual page 20

Using the earbuds
20 | ConC 400
Silicone ear fins
Left
▷
Carefully remove the ear fin from the earbud housing.
▷
Assign the right and left ear fin to the right and left earbud (see
embossing on the bottom).
▷
Align the recess on the ear-facing side of the ear fin ring over the
microphone on the top of the earbud and slip the ring over the
earbud housing. Make sure that the ear fin ring does not cover the
microphone.
▷
Make sure the ear fin ring fits neatly into the duct on the earbud
housing.
▷
Test which ear fin size gives you the best fit and the best wearing
comfort.
You can choose between 2 different ear fins in size M and L. The
ear fin holds the earbud securely in the back of the ear. If you do
not want to use an ear fin, put size S on the earbud.
Right