Saramonic UWMIC9S KIT2 2-Person Camera-Mount Wireless Omni Lavalier Microphone System (514 to 596 MHz) - Manual (Page 6)

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MIC GAIN: Adjust the external microphone’s
gain level (0-15). Default is “13”.
Select channel: For details of operation, please
refer to "Manually setting the receiver channel" (page
10).
Set output volume: Set the volume of output
audio within the range of 0 to 15. The setting
is retained even after the power is turned off.
Default volume is 13.
Auto scan function: Automatically scan an
available and clear channel. For details of
operation, please reter to "Using the auto scan
function" (page 9).
Infrared matching function: Match the receiver
and transmitter via infrared. For details of
operation, please refer to "Matching the receiver
and transmitter channel" (page 10).
Set backlight: Set the background LED light to
ON or Delay by 60, 30, or 10 seconds. Default
setting is "Delay 30s."