Audio-Technica ATH-ANC300TW QuietPoint Noise-Canceling True Wireless In-Ear Headphones - Manual (Page 19)

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Eartips
Eartip size
The product includes silicone eartips in 4 sizes (XS, S, M, and L). At the time of purchase, the M-size silicone eartips are
attached.
To ensure the best sound quality, select the eartip size that is best suited for you, and adjust the eartips inside your ears
for a snug fit. It may be difficult to hear bass sounds if the eartips do not fit snugly in your ears.
Replacing the eartips
Remove the old eartip and attach the new eartip by pushing it onto the headphone at an
angle (see figure).
Push firmly on the eartip so that the inside of the eartip expands, and push the eartip onto
the post as far as it will go.
• Periodically remove and clean the eartips as they become dirty easily. Using dirty eartips may cause the headphones
themselves to become dirty, resulting in deteriorated sound quality.
• Eartips are consumable parts that degrade through storage and use. If the eartips are loose and easily removed or
if they appear to have degraded, purchase replacements.
• When reattaching eartips that were previously removed, be sure to check that they are securely attached. Injury or
illness may occur if the eartips become detached and are left inside the ear.