Motorola TETRA MTM800, Feature User Manual, Page: 16 / 382

8
Uninstalling the Radio
11 Four-Way Navigation Key
Press up, down, left or right for list scrolling, while moving
around the menu hierarchy, or for alphanumeric text
editing.
12 Programmable External Alarm Key
Default function: Used to activate and deactivate the
External Alarm (Horn & Lights).
13 Programmable Speaker Control Key
Default function: Switch speaker On/Off.
14 Programmable Backlight Key
Used to dim or intensify the radio’s backlight. It has five
intensity options.
15 Push-To-Talk Button (PTT)
Press and hold this side button to talk in half-duplex calls
or to initiate a group call, release it to listen.
Press to send status and text messages.
16 Microphone
Before using your MTM800 Enhanced for the first time, remove
the plastic lens protector from the display.
OPTION 1:
Before disconnecting the 13.2V main power supply
from the radio:
1. Switch off the radio.
2. Wait for a minimum of 4 seconds after the radio
Off Switch is released.
Disconnect the 13.2V main power supply.
OPTION 2:
Turn off the main power supply WITHOUT
switching OFF the radio.
Item Description