Yamaha YH-5000SE User Manual page 11

Wearing this product > Putting the headphones on
Use the slider to adjust the position according to the size of your head.
NOTICE
Be careful not to get your fingers or hair caught in the movable part of the slider.
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Do not forcibly pull on the movable part of the slider. These actions may cause a malfunction.
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Do not apply too much force to the mesh covering on the housing, or expose it to impact. This may damage the mesh covering.
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