Nikon S9 - Manual (Page 33)

Operation 31
You can disable/enable the indicator light by pressing
and holding \ button while turning on the S9. The
indicator light will remain disabled for the following
states:
• Idle (not connected to Bluetooth device)
• Standby (connected but not on a call or
streaming music)
• On a call
• Playing or pausing music
Red (quick
flash) low battery
Red (three
flashes) powering off/disabling
indicator light
Light Status