Nokia 7230 User Manual page 21

Headset
Warning:
When you use the headset, your ability to hear outside
sounds may be affected. Do not use the headset where it
can endanger your safety.
When connecting any external device or any headset, other
than those approved by Nokia for use with this device, to
the Nokia AV Connector, pay special attention to volume
levels.
Do not connect products that create an output signal as
this may cause damage to the device. Do not connect any
voltage source to the Nokia AV Connector.
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