
  4GB MP3 Player 
   with FM Radio and Speaker
Key lock
Slide down to lock the keys to 
prevent accidental button 
pressing when on the go.
appears. Slide up to unlock.
Reset
Press if the 
keys do not 
respond. See
Troubleshooting.
Earphone jack
Connect supplied
3.5mm earphones.
USB port
Open cover to 
reveal USB port.
§
Press to turn on; hold down to turn off. 
Press during playback to pause a track or mute sound in radio mode.
/
During playback: Skip to another track; hold down to search within a 
track.
Press 
seconds after current track begins).
For menu navigation: Toggle or confirm options; return to previous 
menu or screen.
In radio mode: Tune frequencies. Hold down to start auto scan or 
select a preset station when appears.
MENU
Hold down to return to the menu during music or radio playback 
display. Press once or more to scroll through main function menus:
Music/Now playing/Setting/Radio.
Scroll through function menus: Music/Radio/Setting/Now playing.
Press during playback to enter Music Options or Radio Options.
Playlist: Press and hold to add a song to Playlist during track 
playback, or enter Playlist view from main Music display.
Display
Shows information 
during playback or 
menu navigation.
 to return to the beginning of the current track (wait 5
Integrated Speaker
Disconnect earphones to listen 
via the speaker.
In FM radio mode, activate 
the speaker mode with your 
earphones connected.
+/–
Increase/ 
decrease the 
volume.
Clip
Clip your player to 
your pocket, belt, 
etc. for handsfree 
music on the go.
What’s Included
42-420/GX400
MP3 Player Mini USB 2.0 cable 
Earphones User’s guide 
Rhapsody™ Software Installation CD
System Requirements
Thank you for purchasing your Gigaware 4GB MP3 Player with FM 
Radio and Speaker from RadioShack. Please read this user’s guide 
before installing, setting up, or using your new product.
www.radioshack.com
• Windows®2000, Windows XP (SP2) or Windows
• Pentium II 200MHz
• 64MB RAM
• 500MB memory space
• CD-Rom drive
• USB 1.1 or USB 2.0
Vista
®
Features
• 4GB flash memory
Getting Started
STEP 1 Charge your MP3 Player
Before using your player for the first time, charge it for about 3 
hours. Flip open the USB jack cover and connect the supplied USB 
cable to the player and your PC.
The player shows the 
followed by the connected to PC display with 
battery charging icon.
The battery full icon appears when fully charged.
Note: Use only the supplied USB cable to charge your player.
 If the player is connected to the PC via a hub, the hub must
be self-powered to charge the player.
STEP 2 Connect to your PC & Download Music
We’ve provided some sample tracks if you want to turn on the 
music immediately (go to STEP 3). To listen to your own songs:
1. Connect to your PC as above for charging your MP3 player. The 
player is automatically detected and the directory removable 
disk appears on your computer.
2. Drag and drop the desired files from your computer to the 
player, OR use music management software, such as Windows 
Media®Player 11 or Rhapsody (included; see Using Rhapsody  
Software).
Important Copyright Notice
Distribution of MP3 files without permission from the content 
owner is against copyright laws. RadioShack will not be liable 
against such actions.
CAUTION! ONLY EJECT THE PLAYER WHEN THE PC ICON HAS
STOPPED FLASHING AND ALL DOWNLOADS HAVE 
COMPLETED to prevent corrupting files and accidentally 
reformatting your player.
Gigaware splash screen,
• Built-in speaker and rechargable battery
• FM radio
• 2 color display
• Five preset equalizer settings
• Supports MP3, WMA, ID3 tag, DRM9 and 
DRM10
• Can be used as a USB flash drive to transfer and 
store any type of files.
Specifications
Built-in flash memory supported.................up to 4GB
Supported file formats......... MP3 (64kbps~320kbps)
.......................................WMA (64kbps~192kbps)
FM radio frequency........................ 87.5~108.0MHz
Signal to noise ratio ....................................> 85 dB
Power....................... Built-in Lithium polymer battery
Playback time .................................. up to 10 hours
Operating temperature............32 to 104ºF (0 to 40ºC)
Language support ......................English and Spanish
Dimensions (H×W×D)..................... 1.4 × 2.1 × .4 in
............................................... (36 × 53 × 11mm)
Weight .......................................... .78 oz. (22.2g)
Specifications are subject to change and improvement 
without notice. Actual product may vary from the images 
found herein.
Using Rhapsody Software (optional)
The supplied CD contains Rhapsody software, an 
optional music file management program and online 
service for your player.
For more information on Rhapsody, 
visit www.Rhapsody.com
To install the software:
1. Load the CD into your PC’s CD-ROM drive. The 
installation starts automatically. If it does not, select 
Start Ö Run, and type the path for your CD drive).
2. Double-click the setup application, follow the onscreen instructions.
3. When setup completes, click Finish.
STEP 3 Play Music
1. Press§to turn on your MP3 player. The Gigaware splash screen appears, followed by Updating 
(updates may take time). When updates are complete, Music displays.
2. Use the navigation buttons to start playing music, or see next page for more detailed instructions.
3. To turn off, press and hold§until the Power Off icon disappears.
©2008. RadioShack Corporation. All rights reserved. Gigaware is a trademark and RadioShack is a registered trademark used by RadioShack Corporation. 
Windows and Windows Media are registered trademarks, and Windows Vista is a trademark of Microsoft Corporation in the United States and/or other countries. 
Rhapsody and Rhapsody logo are trademarks or registered trademarks of RealNetworks Inc. All Rights Reserved.
 

Using Your MP3 Player
Menu Navigation
Press MENU and use the , , , and 
MENU keys to:
• navigate and confirm your option from 4 main 
menus: 
and their respective submenus, and
• exit/return to the previous display.
Music Menu
Contains 6 options to view and 
play your music based on ID 
tag information on your tracks.
Play All – Play all songs in the 
order downloaded to your player.
Artists – Play all tracks in alphabetical order by 
artist or select a listed artist on your player.
Albums – Play all tracks in alphabetical order by 
album or select a listed album on your player.
Songs – Play all tracks in alphabetical order by 
song title.
Playlists – Play songs in your playlist in the order 
you added them.
Now playing – Return to the Now playing 
screen described below.
Now playing
Quickly access the last song 
listened to when you switch on 
the player or enter playback 
display.
Music Options
Access 5 music mode options:
EQ – Five sound options 
available: Normal, Pop, Rock, 
Jazz, Classical.
Repeat – All/One/Off play and repeat all 
tracks, repeats a single track or deactivate the 
repeat options.
Shuffle – On/ Off plays tracks in random order 
if activated.
Add Playlist on the go – press  from this 
menu while a song is playing to add it to this 
playlist. Playlist added! appears. If the song is 
already in the on the go playlist, Song already  
saved appears.
Clear Playlist on the go – press  to confirm 
deleting all tracks from your Playlist. Playlist 
cleared appears.
Note: You can save up to 30 tracks in Playlist
Music, Radio, Setting, Now playing
on the go.
Setting Menu
Contains 7 configuration 
submenus:
Language – Display menus in 
English or Spanish.
Display – select brightness level from dim to 
bright (0-5).
FM Mode – select stereo sound for radio on/off 
(earphones only).
System Info – view software version, total 
memory capacity, free space, and total number 
of tracks stored.
Backlight – Choose to keep the backlight on for 
3, 10, 30, or 60 seconds, or choose Always On.
Auto Power Off – Choose to power the player 
off automatically after 30, 60 or 90 seconds, or 
deactivate the feature (Off).
Reset All – Restore factory settings. Press § to
confirm the reset.
Listening to the Radio
You can listen to the radio 
through earphones or the 
integrated speaker. Tune to 
your stations automatically 
using Auto Scan (see below), 
or manually by pressing the / keys.
Note: The earphones serve as the antenna, so
you must use them even if you listen with 
the speaker.
Radio Options
There are 5 options in Radio mode:
Auto Scan – This option scans up to 30 radio 
frequencies and stores them automatically.
Select Presets – Shows your list of all stored 
stations. Navigate and select your desired 
station. When a valid preset is selected, 
appears. Enter an invalid preset by selecting - - / 
- - MHz to enter manual search mode, 
disappears.
Add Preset – To store a station manually tuned 
(if free preset available).
Del Preset – Select this, then navigate through 
preset list, and press  to delete a preset.
Speaker: Turn speaker On/Off. In regular 
playback mode, speaker is off if earphones are 
plugged in.
Troubleshooting
For mor information and updates, visit 
www.mymusix.com. To contact MyMusix, send an email 
to support@mymusix.com or call 1-866-862-9224 toll 
free.
The player cannot play music files.
• Make sure MP3 files are stored in the proper part 
of the flash memory.
• Make sure the player is in
Music Mode.
• Make sure music files are in a format supported by 
the player.
• If you have DRM10 files, make sure they have not 
expired.
Unresponsive buttons.
• Check if the hold switch is activated.
• Make sure music files are in a format supported by 
the player.
• Connect to your PC and check if the file system is 
NTFS. If yes, change format to FAT or FAT32.
• Use a paperclip or other pointed object to press the
Reset button, then switch on the player again.
No sound comes from the earphones or speaker.
• Make sure the earphones are firmly plugged in and 
make sure the volume is not set to minimum.
• Make sure
Speaker option is On in radio mode.
Formatting your Player
Format your player if it malfunctions and you cannot 
remedy the problem from the above hints. All file 
content in the player will be deleted after formatting, so 
make sure you back up your files from time to time.
1. Connect the player to your PC as described in 
“STEP 2.”
2. Right-click the drive icon and click “Format.”
3. Click “OK” to confirm.
Care and Maintenance
• Never use the device in a strong magnetic field as this 
may result in data being lost.
• Avoid exposing the player to strong sunlight, heat sources, 
high humidity and extreme temperatures.
• Keep your MP3 player dry. If it gets wet, wipe it dry 
immediately. Keep your MP3 player away from dust and 
dirt, and wipe it with a damp cloth occasionally to keep it 
looking new.
• Handle your MP3 player carefully; do not drop it.
• Modifying or tampering the MP3 player’s internal 
components can cause malfunction and might invalidate its 
warranty. If your player is not performing as it should, take 
it to your local RadioShack store for assistance.
Listening Safely
To protect your hearing, follow these guidelines when you 
listen to the player:
• Do not listen at extremely high volume levels. Extended 
high volume listening can lead to permanent hearing loss.
• Do not wear earphones while operating a motor vehicle or 
riding a bicycle. This can create a traffic hazard and could 
be illegal in some areas.
• Set the volume to the lowest setting before listening. After 
you begin listening, adjust the volume to a comfortable level.
• After you set the volume, do not increase it. Over time, 
your ears adapt to the volume level, so a volume level that 
does not cause discomfort might still damage your hearing.
RF Emissions Information
This equipment has been tested and found to comply with 
the limits for a Class B digital device, pursuant to Part 
15 of the FCC Rules. These limits are designed to provide 
reasonable protection against harmful interference in a 
residential installation. This equipment generates, uses, 
and can radiate radio frequency energy and, if not installed 
and used in accordance with the instructions, may cause 
harmful interference to radio communications. However, 
there is no guarantee that interference will not occur in a 
particular installation. If this equipment does cause harmful 
interference to radio or television reception, which can be 
determined by turning the equipment off and on, the user 
is encouraged to try to correct the interference by one or 
more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and 
receiver.
• Connect the equipment into an outlet on a circuit different 
from that to which the receiver is connected.
Consult your local 
radio/TV technician for help.
If you cannot eliminate the interference, the FCC 
requires that you stop using your equipment. Changes or 
modifications not expressly approved by RadioShack may 
cause interference and void the user’s authority to operate 
the equipment.
This device complies with Part 15 of the FCC rules. 
Operation is subject to the following two conditions: (1) This 
device may not cause harmful interference, and (2) This 
device must accept any interference received, including 
interference that may cause undesired operation.
RadioShack store or an experienced
Product 4GB MP3 Player with FM
Model 42-420/GX400
Responsible 
Party
Phone 817-415-3200
Radio and Speaker
RadioShack 
300 RadioShack Circle 
Fort Worth, TX 76102
Warranty Information
MyMusix offers 12 months warranty for 42-420/GX400 
players purchased only from RadioShack company-owned 
stores and authorized RadioShack franchisees and dealers. 
MyMusix products qualify for warranty repair as long as the 
unit has not been damaged. If the unit has damage to the 
casing, OLED screen or the USB port, then it will not be 
repaired under warranty and the warranty will be voided. 
Accessories such as earphone, USB extension cable and 
USB cap are not covered under warranty.
Please contact support@mymusix.com for help.
Protect the environment by recycling used 
electronics. Go to www.ecyclingcentral.com 
to find a recycling location near you.
08A08
Printed in China
42-420