Nikon COOLPIX L820 Reference Manual page 87

Restricted
function
Flash mode (_ 54)
Motion detection Continuous (_ 65)
Shutter sound
Option DescriPtion
When the flash fires, Motion detection is disabled.
When Continuous H: 120 fps, Continuous H: 60
fps, or Multi-shot 16 is selected, Motion detection
is disabled.
When the ISO sensitivity is set to any setting other
(_ 65) than Auto, Motion detection is disabled,
When a setting other than Single is selected, the
Continuous (_ 65) shutter sound is not heard.
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