4
EN
NOTE:
Do not mix old and new batteries.
Do not mix alkaline, standard, or rechargeable batteries. 
Batteries may not be charged in ambient temperature 
above 45 °C or 113 °F.
3.2 Switching the headset on and off
Press and hold the On/Off/Mode button (A:9) until a 
message is heard to switch the headset on or off. The 
voice message will conrm that the unit has been switched 
on or off. The last setting is always saved when the 
headset is switched off.
NOTE: Power is switched off automatically if the product 
has been inactive for two hours. Automatic power-off is 
indicated by a voice message: “automatic power off” 
followed by a series of short tones for 10 seconds, then the 
unit is switched off.
3.3 Automatic power off
After two hours (from the last button press or VOX 
transmission) the headset will automatically power off.
3.4 Scrolling through the menu
Press the On/Off/Mode button (A:9) to browse through the 
following menu items:
3.5 Radio volume (level)
Press the (+) button (A:10) or (–) button (A:11) to adjust the 
volume to one of ve levels. To turn the volume off, press 
the (–) button for two seconds. This is conrmed by the 
message “radio volume off”. Press the (+) button to switch 
this function back on.
NOTE: No radio communication can be heard when the 
volume is switched off.
NOTE: When the volume is switched off, all other radio 
conguration menus will be unavailable.
3.6 Channel (radio frequency)
No. MHz
1 446.00625
2 446.01875
3 446.03125
4 446.04375
5 446.05625
6 446.06875
8 446.09375
Press the (+) button (A:10) or (–) button (A:11) to select 
between 8 available channels, see Radio Frequency Table.
3.7 VOX (voice-operated transmission)
VOX is a hands-free substitute for the Push-To-Talk (PTT) 
button. With VOX, you simply speak into the microphone to 
open the channel. The VOX setting denes the acoustic 
threshold that activates the radio transmission. Higher 
settings are appropriate for louder environments. To adjust 
the sensitivity of VOX, press the (+) button (A:10) or (–) 
button (A:11) when on the VOX menu setting. You can 
choose between ve levels or switch this function off. To 
turn the VOX function on and off, press the PTT button 
twice. Alternatively, when on the VOX setting in the menu, 
press the (–) button for two seconds to turn VOX off. Press 
the (+) button to switch this function back on. If VOX is off, 
the PTT button must be used to transmit.
NOTE: By default, the Busy Channel Lock Out (BCLO) 
function will prevent VOX operation if the channel is 
occupied with other transmission (“busy”) and you will hear 
an audible tone to indicate the blocked transmission. 
These settings can be adjusted in the setup menu.
NOTE: To effectively use VOX, the speech microphone 
(A:8) must be very close to your mouth, less than 3 mm 
(1/8 inch). You will hear your voice in the headset when the 
radio is transmitting.
3.8 Squelch (hiss reduction)
The “squelch” feature will reduce the distracting radio hiss 
or static noise. You can choose between ve squelch levels 
by pressing the (+) button (A:10) or (–) button (A:11). A 
higher squelch level will further reduce the noise, but will 
also reduce your range of reception. To switch this function 
off, press the (–) button for two seconds. Press the (+) 
button to switch this function back on.
3.9 Sub channel (selective squelch)
1. 67.0 15. 110.9 29. 179.9
2. 71.9 16. 114.8 30. 186.2
3. 74.4 17. 118.8 31. 192.8
4. 77.0 18. 123.0 32. 203.5
5. 79.7 19. 127.3 33. 210.7
6. 82.5 20. 131.8 34. 218.1
7. 85.4 21. 136.5 35. 225.7
8. 88.5 22. 141.3 36. 233.6
9. 91.5 23. 146.2 37. 241.8
10. 94.8 24. 151.4 38. 250.3
11. 97.4 25. 156.7
12. 100.0 26. 162.2
13. 103.5 27. 167.9
14. 107.2 28. 173.8
The sub channel feature can be used to set up multiple 
private groups within a single channel. When the sub 
channel feature is active, an inaudible code will be 
transmitted with the speech and only the receivers with the 
same sub channel setting will hear the transmission.