Saramonic UWMIC9S KIT2 2-Person Camera-Mount Wireless Omni Lavalier Microphone System (514 to 596 MHz) - Manual (Page 11)

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Note:
After 20 seconds have elapsed, the display
returns to the home screen without saving.
Some noise may occur when power is
turned on, so it is possible to turn down
the audio input level of devices connected
to the receiver accordingly.
Manually setting the receiver channel:
Use the + or – button to display the channel
menu on the receiver.
Long press the SET button to select the menu.
Use the + or – button to select the desired
channel and confirm it by short pressing the SET
button.
4. Matching the receiver and transmitter
channel:
Infrared transmission is used to transfer the
frequency set on the receiver to a transmitter.
For the TX9S
• Turn on the transmitter and receiver.
• Use the + or – button to display the “Match
with TX” menu on receiver.
• Use the + or – button to display the "Match
with RX" menu on transmitter.
• Long press the SET button to select the menu
and then short press it to confirm.
• Place the infrared transmitter port on the
receiver near the infrared detector on the
transmitter.
• If "Sync Finished" is displayed on the
OLED screen, the frequency for use on the
transmitter is set.
• After matching successfully, press the SET
button on the receiver to return to the previous
menu.