Sony LinkBuds S YY2950 Reference Manual page 15

Hold the headset unit and twist the earbud tip while rotating it to pull it out.
Do not pinch the end of the earbud tip when removing it.
Attach the earbud tip.
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Firmly insert the earbud tip all the way. Do not attach the earbud tip in a loose or skewed manner.
Related Topic
Wearing the headset
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