Yamaha TW-E3C True Wireless Earbuds (Red) - Manual (Page 30)

Replacing the eartips
When using different eartips, select the size that matches your ears. When putting the earbuds on, choose
the eartips that keep out ambient sounds as much as possible while the audio is stopped.
Eartip
NOTE
Four sizes of eartips are included with this product. The earbuds come pre-attached with M-size eartips.
CAUTION
( Do not use broken eartips or wear the earbuds without eartips. Doing this may damage your ears.
(
Make sure that the eartips are firmly attached to the earbuds. Failure to do so may cause the eartips to come loose inside your
ears, which may damage your ears. If an eartip comes loose inside your ear, consult a physician.
( Once removed, keep the eartips out of reach of children, to prevent them from being accidentally swallowed.
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Wearing This Product > Replacing the eartips