User's Guide

U3 USER GUIDE
15
Side Buttons
Description
Digital Voice Record
(DVR) Button
Press this button to record voice communications.
Push-to-Talk (PTT)
Button
The PTT button on the left side of the radio is used to
transmit to other radios. When you want to speak,
press and hold the PTT button to activate the
microphone and transmit the voice. Release the PTT
button to listen.
Function Status
Button
Press this button to enter Status indication ON/OFF
Button. You can have a quick overview and settings on
some common functions.
Keypad lock Button
Press this button to lock / unlock the keypad.
Emergency Button
Press this button to make an Emergency Alarm.
LED INDICATORS
No
LED
Behavior
definition
1
Green/Amber two-way
function LED
1-1
Flashing green
Radio transmitting
1-2
Solid Amber
Radio receiving
2.2 TURNING U3 ON AND OFF
2.2.1 Turning On
1. Rotate the power/ volume knob clockwise and a click sound
will be heard when the power is on.
2. Once the power is up, a self test program will automatically
start. If the test is successful, the display will play greeting
message on the screen.
3. After greeting message, the radio will automatically enter
Home screen.
Turn On
Turn Off