Audiovox FR-531 owner manual Key Lock, VOX Function

to enter Dual Watch mode, and using the s t buttons, select “0” as a new channel number.

When in Dual Watch mode, the unit will always transmit on the primary channel. To communicate with someone on the secondary channel, you must change the primary channel number.

Key Lock

This feature prevents accidental change of unit settings. While enabled, Key Lock allows only the PTT button to operate.

To enable Key Lock, press function button for more than 3 seconds until Key Lock icon () appears. To disable the Key Lock function, press function button for more than 3 seconds until Key Lock icon disappears.

VOX Function

This feature enables you to have hands-free conversation. When using the internal microphone/speaker or external microphone/headset (purchased separately), your voice or the signal is detected and the radio transmits and receives automatically.

To access the VOX function, press the VOX button; the VOX icon () appears on the display. In the VOX mode, the sensitivity is automatically set. To exit the VOX mode, press the VOX button again; the VOX icon will disappear from the display.

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