Simrad RS40 User Manual page 22

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channel. Holding either key will, after a short delay, step rapidly
through the channels.
16.
VOL +/- (Volume) (Handset mic only)
Change the volume on the handset microphone.
Short press (+) increases the volume, or (-) decreases the volume.
17. PTT (Push-to-talk) (Handset mic and wireless handset)
Press button to transmit. Only depress for duration of message to be
broadcast. Radio can't receive while it is transmitting.
18.
Handset microphone (front) connection. Plug in the removable
handset microphone. Alternatively, it can be connected to the rear
of the radio.
19.
MIC (Microphone) (Handset mic and wireless handset)
The microphone can be connected to the front MIC connector or
rear MIC connector. An optional 5 m or 10 m extension cable is
available for mounting the microphone in a different location.
20. POWER / EXIT (Wireless handset)
Short press to EXIT when navigating menus, to clear incorrect
entries, to exit from a menu without saving changes, and to back up
to the previous screen.
Long press to turn radio on or off.
21. OK / H/L (Wireless handset)
Short press to make selections in menus.
Long press to change transmission power - see item 14.
22.
VOL / SQL (Wireless handset)
Short press to select which control (Volume and Squelch) to adjust.
Use the + & - buttons to adjust.
23. +/- (Wireless handset)
Short press to adjust the selected control (Volume and Squelch).
24. LCD (Display) (Radio and wireless handset)
General Information | RS40/RS40-B User Guide