Audio-Technica ATH-SQ1TW True Wireless In-Ear Headphones (Popcorn White) - Manual (Page 29)

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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. 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.
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.
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.
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.