Replacing the earbuds
M-sized hybrid silicone rubber earbuds come attached to the left and right units of the headset at the time of purchase. If the earbuds tend to come off or you feel that there is insufficient low frequency sound and a difference in volume between the left and right units, change the earbuds to another size to comfortably and snugly fit your left and right ears.
Hybrid silicone rubber earbuds
The size of the earbuds can be determined based on the number of dotted lines inside the bottom of the earbuds.
SS size: 1 line
S size: 2 lines
M size: 3 lines
L size: 4 lines
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Remove the earbud.
- Do not pinch the end of the earbud when removing it.
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Attach the earbud.
- Firmly insert the earbud all the way. Do not attach the earbud in a loose or skewed manner.
https://helpguide.sony.net/