41PANEL DESCRIPTION1PRIO A/B KEYS➥ Push to select Priority A or Priority B channel.➥ Push and hold [Prio A (Rewrite)] or [Prio B (Rewrite)] to setthe operating channel as the Priority A or Priority B chan-nel.MR-CH 1/2/3/4 KEYSPush to select the memory channel 1 to 4 directly.MONI (AUDI) KEY➥ Mute and release the CTCSS (DTCS) or 2-tone squelchmute. Open any squelch/deactivate any mute while push-ing and holding this key. (LMR operation only)➥ Activates one of (or two of) the following functions on eachchannel independently: (PMR or BIIS PMR operation only)• Push and hold to un-mute the channel (audio is emitted;‘Audible’ condition).• Push to mute the channel (sets to ‘Inaudible’ only).• Push to un-mute the channel (sets to ‘Audible’ only).• Push after the communication is finished to send a ‘reset code’.(BIIS PMR operation only)NOTE: The un-mute condition (‘Audible’ condition) mayautomatically return to the mute condition (‘Inaudible’ con-dition) after a specified period depending on programming.PUBLIC ADDRESS KEYPush to activate the Public Address (PA) function for voiceamplification. When the PA function is activated, the audiooutput can be controlled from the transceiver separately withthe [VOL] control knob.• This function is available when the external unit, such as a audioamplifier, speaker, etc. is additionally connected.• Push this key, then speak into the microphone while pushing andholding [PTT].• [CH Up]/[CH Down] also allow you to set the audio output level.RX SPEAKER KEYThe received audio can be heard via the external speakerwhen this key is pushed.• This function is available when the external speaker is additionallyconnected.• This function is useful when you are out of the vehicle.• The audio output level is linked to the transceiver’s volume control.LIGHT KEYPush to turn the transceiver’s backlight ON for about 5 sec.when the backlight function is turned OFF in user set mode.LOCK KEYPush and hold to electronically lock all programmable keysexcept the following:[Moni(Audi)], [Light], [Lock], [Call] (incl. Call A and Call B),[Emergency Single]/[Emergency Repeat] (incl. Silent), [Surveillance]and [OPT 1/2/3].