Audiovox FR-530 - Manuel (Page 12)

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press the function button to enter Dual Watch mode, and using
the ▲ ▼ 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 some one on the secondary channel,
you must change the primary channel number.
Key Lock Key Lock Key Lock Key Lock 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.
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