Yamaha TW-E7B Noise-Canceling True Wireless In-Ear Headphones (White) - Manual (Page 24)

Replacing the eartips
When using different eartips, select the size that matches your ears. When putting the earbuds on, use the
eartips that keep out ambient sounds as much as possible while the audio is stopped.
Eartip
NOTE
Five 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 so may damage your ears.
( Firmly attach the eartips. Failure to do so may cause them 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 avoid them being accidentally swallowed.
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Wearing This Product > Replacing the eartips