Silvercrest SPMR1 B1 Operation And Safety Notes page 22

Step 2: Press the Up button 5 to set the sensitivity of the VOX function.
The higher the set value the more sensitive the VOX function will become.
You can set a value from "1" to "3".
Step 3: To deactivate the VOX set the value to "0".
Step 4: Press the PTT button 14 to confirm the setting.
NOTE: It would be preferably to use this function in combination with
a headset. Keep in mind that it can take over a second after you have
started talking before the handheld transceiver starts transmitting.
Channel scan
Use this function to scan all active channels (1-16) in the loop.
Step 1: Briefly press the button 7 to start scanning
Step 2: Briefly press the Up button 5 or Down button 8 to continue
scanning if you are only receiving noise on certain channel.
Step 3: If the reception of the same channel keeps during the scan,
you may remove this channel from the scan by pressing and holding Up
button 5 or Down button 8 for 2 seconds. Then the scan will resume
but the selected channel will be skipped.
NOTE: You cannot remove a channel to which the walkie-talkie was
set when the scan was started. The next time you initiate a channel scan,
all channels will be scanned again.
Step 4: Press the Monitor/Channel Scan button 7 again to end the
scan.
Dual channel scan
Use the 2 channel scan to consecutively monitor the channel to which the
handheld transceiver is currently set and a 2nd channel.
Step 1: Press the Menu button 6 5 times and the "2CH" icon 20 will
appear on the display 1 .
Step 2: Use the Up button 5 or the Down button 8 to select the 2nd
channel ('OF' means Off).
Step 3: Press the PTT button 14 to confirm.
Step 4: Repeat these instructions and select the option 'OF' in step 2 to
disable this function.
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