Audiovox FR530 - Ultra Compact 14 Channel LCD Radios Owner's Manual page 12

monitor for activity. Press the function button to enter your selection.
The channel display will now flash showing your current channel
and alternate channel selection. To disable Dual Watch mode,
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
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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