Uniden America Corporation ON525 User Manual

Congratulations on your purchase of a Uniden GMRS/FRS 

radio. This lightweight, palm-sized radio is a state-of-the-art 

device, equipped with many valuable features. Use it at 

sporting events, to stay in contact with family and friends, 

hiking, skiing, outdoors, or in a neighborhood watch for vital 

communication.

•  15 GMRS/7 FRS 

Channels

•  Battery Charging Cradle 

(GMR3055-2CK and 

GMR3055-2CKHS)

•  121 Privacy Codes

•  NOAA Emergency/Weather 

Channels

•  Up to 30-Mile 

Range*

•  Weather alert

•  Channel Scan

•  microUSB charging jack

•  VOX Headset Jack

•  10 Selectable Call Tone 

Alerts

•  Roger Beep

*  Range may vary depending on environmental and/or 
topographical conditions.

1

Antenna

7

Speaker

2

USB Charge Port/ 

Headphone Jack

8

Channel and 

Volume 

3

Push to Talk

9

WX/LOCK

4

Microphone

10 CH/Backlight

5

MENU/Power

11

Screen

6

CALL/MON

 

All models come with:
•  2 radios (3 radios for GMR3055-3VP)
•  6 AA rechargeable NiMH batteries (9 NiMH 

batteries for GMR3055-3VP)

•  2 belt clips (3 belt clips for GMR3055-3VP)
•  This reference guide 

GMR3055-2CK also has:
•  1 battery charging cradle
•  1 AC adapter/single microUSB cable

GMR3055-2CKHS also has
•  1 battery recharging cradle
•  1 AC adapter/single microUSB cable
•  2 earbud-style headphones (GMR3055-

2CKHS

GMR3055-3VP also has:
•  1 AC adapter/Y-Split microUSB charge cable 

(GMR3055-3VP) 

Visit our web site at www.uniden.com to order 

accessories.
Use only Uniden accessories.

The radio operates on the General Mobile Radio 

Service (GMRS) frequencies which require a 

Federal Communications Commission license to 

operate. For licensing information and  

application forms, visit the FCC on-line at: www.

fcc.gov/wtb/uls or call the FCC  hotline at 1-800-

418-3676. If you have any questions you can 

contact the FCC direct at 1-888-225-5322.

Each radio uses 3 AA rechargeable NiMH 

batteries (included).

To install the batteries:

1.  If installed, remove the belt clip.
2.  Remove the battery compartment door by 

pressing on the latch and releasing the 
cover. Remove it.

3.  Install the supplied 3 NiMH batteries into 

the battery compartment. Be certain to 
follow the + and – symbols in the 
compartment. Installing the batteries 
incorrectly will prevent the unit from 
operating.

4.  Replace the battery compartment door.
5.  Replace the belt clip if necessary.
6.  Repeat for each radio.

 

Review the following tips before charging your 

radios:

•  Install the batteries before connecting the AC 

adapter to the radio and power source.

•  The battery icon flashes while the radio 

charges, whether the radio is turned on or not. 

The charge stops after 14 hours of continuous 

charging. If there is a power interruption, the 

charging timer resets to 14 hours. If the radio 

is off and charging stops, the battery icon 

stops flashing.

•  Charge time may vary depending on the 

battery life remaining. For fastest charging, 

turn off the radio before charging.

•  If battery power is low, you cannot operate the 

radio even using external power. If you try to 

transmit while power is low, the radio will 

automatically turn off. Recharge the batteries.

These models use a charging cradle (included) 

to charge their NiMH batteries. 

1.  Plug the charging cradle into an AC adapter 

and then plug the AC adapter into a power 
source (wall outlet). .

2.  Install the NiMH batteries in the radios.
3.  Place the radios in the charging cradle. The 

radios begin charging and the red LEDs 
turn on.

4.  The radio is fully charged when 

the red POWER LEDs go off.

This model charges through a microUSB 

Y-branch cable (included) with an AC adapter 

that plugs into an AC power source.

1.  Plug one branch of the microUSB Y-Cable 

into each radio's microUSB charge port. 

2.  Insert the AC adapter into an AC power 

source (wall plug).

3.  The radios are charged after 14 hours 

when the battery icon on the screen stops 
flashing.

1.  Press and hold the MENU/

key to turn 

the radio ON.

2.  To change the volume level, press the 

▲

 or 

▼

 key to increase or decrease the 

volume level. There are 8 volume levels (L1 
- L8) plus volume off (L0)

3.  Press and hold the MENU/

 key to turn 

the radio OFF.

The GMR3055-2CKHS radio comes with earbud 

headphones for each radio. You can purchase 

optional earbuds or headsets for other radios if 

desired. See www.uniden.com to purchase 

authentic Uniden products.

Using the earbuds lets you have more private 

communications. To use the earbuds, lift the 

rubber cover from the headset jack, then plug in 

the earbuds. The microphone is on the earbud 

cable.

Important: Your radio is not weather resistant 

when using a headset jack. When you remove 

the earbuds, be sure to fully press the cover into 

place to restore its weather resistant capability.

Press MENU/

to access the three menu 

options:
•  Privacy Code (121 codes). The privacy codes 

display underneath the channel number on 

the screen.

•  Call Tone (10 call tone options plus Off)
•  VOX (5 levels plus Off) 

Each menu option is discussed later in the 

manual with the feature that uses it.

Your radio has 22 channels you can use to talk 

to others. In order to speak to someone, each of 

you must be set to the same channel and 

privacy code.

Each of the channels 1-22 may have any one of 

the privacy codes, 0 (OFF), or 1-121 selected. 

Code oF (OFF) indicates no privacy code 

selected and your radio can receive a signal 

regardless of the code settings of the 

transmitting radio.

To choose a privacy code:

1.  Press MENU/

until the privacy code 

number flashes below the channel number.

2.  Press ▲ or ▼ to cycle through the privacy 

codes. 

3.  The radio returns to its normal state after 

about 10 seconds.

To choose a channel:

1.  Press the CH/

 key to access the channel 

function; the channel number flashes.

2.  Press ▲ or ▼ to manually cycle through

the channels. 

3.  Press CH/  to set the channel.

Your radio is equipped with a user selectable Voice 

Operated Transmitter (VOX) that can be used for 

automatic voice transmissions. The VOX feature is 

designed to be used with or without a headset with a 

microphone. Transmission is initiated by speaking into 

the microphone instead of pressing PTT.

To select a VOX level:

1.  Press 

 repeatedly until the vox icon and 

the VOX sensitivity level (OFF, 1-5) blink.

2.  Press 

▲ or ▼ to change the VOX sensitivity 

levels. Use level 5 for increased sensitivity to 
voice in normally quiet environments, and use a 
lower level to reduce undesired activation in very 
noisy environments.

3.  The radio returns to its normal state after about 

10 seconds.

Your radio has a channel scan feature that allows you to 

easily scan all 22 channels. When an active channel is 

detected, the unit pauses on that channel until the 

channel is clear. Then, after a 2 second delay, the radio 
continues scanning. Press CH/

 

to resume scanning 

while the radio is stopped on an active channel. 

When the unit stops on an active channel, you can 
press the PTT button to transmit on that channel.

Press CH/  then hold ▼ or ▲ for 3 seconds. The

radio will repeatedly cycle through all 22 channels. To 

reverse scan direction, press the other directional icon. 

Press MENU/  or CALL/MON to stop scanning. Press  

to resume scanning in the same direction it was 

scanning previously.

Silent mode turns off all key beeps when it is turned on. 

It does NOT mute call or voice signals received. 

Change Silent mode status (OFF or ON) by first turning 

OFF the radio. 
•  To turn Silent mode off, press and hold the MENU/

key to turn the radio ON. Silent mode is off and 

key beeps sound. (Default)

•  To turn Silent mode on, press and hold the CALL/

 and MENU/  keys to turn the radio back ON. 

Silent mode turns on and no key beeps sound.

When the radio stops on a channel that is transmitting, 

you can talk to others on that channel. 

1.  Press and hold the PTT button and speak in a 

clear, normal voice about 2-3 inches away from