Microtech CBL15C/256W1 Quick User Manual page 42

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Do not use chemicals or detergents to clean the product,
they may corrode the surface.
Avoid using your device with wet hands in order to avoid
unexpected electrical discharges.
All wireless devices are susceptible to interference, which
could affect performance.
Do not use your CoreBook Lite in petrol stations, near
fuels or chemicals.
To prevent possible hearing damage, it is recommended
to keep the volume into a safety level. Long-lasting
exposure to high volume sounds may cause hearing
damage.