Motorola B3 MTX Series Operating Instructions Manual page 18

10 Getting Started (cont.)
Turns the radio on or off, and adjusts the volume level.
Selects the operating system and mode.
Programmed at shipment to turn scan on (position B) and turn scan off
(position A). Position C not programmed at shipment.
Indicates the radio's operating status; green/red light-emitting diode (LED).
(See "Indicator LED Indications" paragraph.
Programmed at shipment as telephone receive button. Programmable via
RSS for volume set.
Programmed at shipment to delete "nuisance mode".
Unprogrammed at shipment, but programmable via RSS for volume set.
Programmed at shipment as the "Private Conversation™ receive button.
Puts the radio in the transmit mode.
Accepts voice input to the radio's microphone.
Provides access for programming, testing, and accessory connections.
Reduces background noise during transmit.