Pioneer SE-C4BT Operating Instructions Manual page 15

3. Replacing the earphone tip
<Installation>
Turn the earphone's skirt inside out as shown in the accompanying illustration.
Press the mounting surface firmly onto the nozzle. Failure to press the tip fully onto
the nozzle may cause the tip to come off.
Return the inside-out skirt to its original shape.
<Removal>
Hold the earphone body securely and twist off the earphone tip.
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