Retevis RB89, User Manual, Page: 6 / 15

the channel is locked.
14. Scan (Carrier Scan)
Defined the PF1/PF2 button is the Scan function in the software.
Long press the PF1/PF2 button, start scanning after a beep, receiving when scanning a valid signal, and re-enter
the scanning mode after 5 seconds when the signal disappears.
Long press the PF1/PF2 button again, and turn off the scan function after a beep tone.
15. TOT (Time out Timer)
To prevent certain users occupy long periods of the current channel in communication, users can activate the
TOT function. The radio will stop transmitting and prompt a beep when users transmit continuously over the
setting time in the current channel.
Set up the TOT time via programming software. 30-180 seconds (default is 60s) optional.
16. Bluetooth Switch
Defined the PF1/PF2 button is a Bluetooth switch in the software. (Default is PF2 button)
Long press the PF2 button and wait for the tone to turn on the Bluetooth while the Bluetooth icon display and
flashes on the screen.
Long press the PF2 button and wait for the 'beep, beep' tone to turn off the Bluetooth function.
Note that the Bluetooth icon stops flashing in connecting status. Bluetooth icon flashing when the connection is
broken.
Bluetooth headset operation instruction
17. Bluetooth headset operation instruction
1. Power on/off button. Press this button for 1 second to power on, and long press for 3 seconds to power off.
2. + button to create the volume.
3. – button to decrease the volume.
4. PTT button.
A short press to transmit and release to cancel when connecting the radio.
B Short press to play/suspend and answer/hang up, and double-click to make calls when connecting to your
phone.
Note, if you connect to your radio and phone simultaneously, it is invalid to transmit/cancel transmit on your radio
when using your phone.
5. Touch PTT. Touch to transmit on your radio, release to stop transmitting.
6. Connect to a new device. In power-off status, press the power on/off button for 5 seconds into pairing mode.
7. Clear connection memory. In power-on status, combo 4 PTT button and hear a 'beep' to clear Bluetooth
connection memory. After reboot, the Bluetooth headset goes into pairing mode automatically.
8. APP upgrade. In power-on status, combo 5 Power on/off button to enter APP upgrade mode.
9. Indicator:
Power on: Blue light.
Bluetooth has not connected: Blue light blinks rapidly.
Bluetooth is connecting: Blue light flashes a blink per 5 seconds.
Bluetooth pairing: Red blue lights flash.
In-call: Red light.
Low battery: Red light flashes a blink per 5 seconds.
Shutdown: Blinking red 3 times.
04
Touch PTT
Indicator
PTT button
Type-C charging
Mic
Volume-
Power on / off