Motorola MTP850 Ex User Manual page 22

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Before using your MTP850 Ex/MTP810 Ex for the first time,
remove the plastic lens protector from the display, and charge
battery overnight to ensure battery is initialised to it's full
capacity.
Take care to clean the side connector frequently and particularly
prior to the programming procedure e.g. with a soft brush (do not
use fluids).
It is recommended to turn off the terminal before connecting any of
the accessories.
14
Push-To-Talk Button (PTT)
Press and hold this side button to talk in simplex calls,
release it to listen.
Press to send status and text messages.
Programmable Side Keys 1 and 2
Default programming: upper Side key activates/
deactivates Backlight; lower Side key activates Screen
Saver.
Earpiece
Programmable Rotary Knob
Default programming: "Dual" - Press the knob to toggle
between "volume" and "list". Side keys (No. 17) operate
as programmed.
Emergency Button (on top of the terminal)
Press and hold to enter Emergency Mode, and send
Emergency Alarms (as programmed). When the
MTP850 Ex/MTP810 Ex is Off, press and hold to power
on in Emergency Mode or in normal mode (as
programmed).
LED (Indicator)
Description