13 OPTIONS13-3The transceiver has a VOX function, which allowshands-free operation.An optional HS-94, HS-95 or HS-97 headset and theVS-4LA ptt switch cable or OPC-2004LA adaptercable are also required for operation.What is VOX?The VOX (voice operated transmission) functionstarts transmission when you speak into themicrophone, without pushing [PTT], and thenautomatically returns to reception when you stopspeaking.D Optional unit connection1. Hold down [ ] for 1 second to turn OFF thepower.2. Remove the jack cover. (p. 1-3)3. Connect the optional HS-94, HS-95 or HS-97 andVS-4LA or OPC-2004LA.CAUTION: DO NOT use the transceiver withoutthe connector cover or the optional microphoneattached. The transceiver meets IP54 requirementsfor dust protection and splash resistance only whenthe connector cover or the optional microphone isattached.DisplayedPush , and then push .D Turning the VOX function ON or OFF1. Connect an optional headset and plug adaptercable to the transceiver, and then turn ON thepower.2. Push [FUNC], and then push [VOX] to turn theVOX function ON or OFF.• “VOX” is displayed when the VOX function is ON.NOTE:• When using the VOX function, adjust themicrophone gain and the VOX-related settings(p. 13-4) to suit your operating environment(including your headset performance).• Set the microphone gain before setting the VOXgain in the Set mode. (p. 9-3)We recommend setting the microphone gain to 3.• When ‘TX permission’ is set to “OFF” in the Setmode (p. 9-3), you cannot transmit using theVOX function.[ ](Turn OFF)OPC-2004LA HS-94132VOX function