Fcc compliance – Bolt VS-570F Wireless TTL Flash for Cameras User Manual
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Troubleshooting
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Problem
Solution
There’s a whining sound coming
from the flash.
This is normal and does not indicate a malfunction. When the flash
becomes warm from continuous use, vibrations inside the unit may
cause this sound. It will dissipate as the unit cools.
FCC Compliance
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause
undesired operation.