Rio Yes LAHC6 User Manual page 21

Note: If you experience unexpected behaviour of this product
then it is possible some external electromagnetic interference
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is responsible e.g. electric motors/loudspeakers etc. You
should remove this source and restart the product to restore
full operation. At no time will the laser fire unintentionally.
Resetting after 'lockout'
If you experience a 'lockout' as indicated by the
simply reset by turning the unit off using the security key,
waiting 5 seconds and turning the unit on again.
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Mute button
Press the mute button on the back of the unit to turn off the sound.
Press again to turn back on.
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error
Note: This doesn't turn off warning
sounds.
symbol,
21