Mio A501 - Manual (Page 14)

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Safety Precautions
Prolonged listening of music in maximum volume can damage the ears.
The use of headphones other than those recommended/supplied can
cause hearing impairment due to excessive sound pressure.
DO NOT use the flash/flashlight close to or direct on human (especially
children) or animal eyes. Exposure to the intense light emitted from the
flash may damage eyesight.
About the AC Adapter
CAUTION: Use only the AC adapter (PSC05R-050 PH or
PSAA05R-050) supplied with your device. Use of another type of AC
adapter will result in malfunction and/or danger.
This product is intended to be supplied by a LISTED Power Unit marked
with “LPS,” “Limited Power Source” and output rated + 5 V dc / 1.0 A
maximum.
Do not use the adapter in a high moisture environment. Never touch the
adapter when your hands or feet are wet.
Allow adequate ventilation around the adapter. Avoid locations with
restricted airflow.
Connect the adapter to a proper power source. The voltage and
grounding requirements are found on the product case and/or packaging.
Do not use the adapter if the cord becomes damaged.
Do not attempt to service the unit. There are no serviceable parts inside.
Replace the unit if it is damaged or exposed to excess moisture.