Motorola ASTRO XTL 2500 User Manual page 127

Secure Operation
6 To abort this menu, press the HOME button or the PTT button.
Pressing HOME exits the key-select menu without saving the
selected key choice.
Pressing the PTT button exits the menu without saving the
selected key choice and allows the radio to transmit.
When you abort the key-select menu, the radio uses the key
that was selected prior to entry into the menu.
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ASTRO XTL 2500 Digital Mobile Radio with M5 Control Head