08A08
42-420
Printed in China
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
RadioShack store or an experienced
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.
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.
Menu Navigation
Press MENU and use the , , , and 
MENU keys to:
• navigate and confirm your option from 4 main 
menus:
Music, Radio, Setting, Now playing
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
on the go.
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 par t 
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.
Protect the environment by recycling used 
electronics. Go to www.ecyclingcentral.com 
to find a recycling location near you.
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.
Product 4GB MP3 Player with FM
Radio and Speaker
Model 42-420/GX400
Responsible 
Party
RadioShack 
300 RadioShack Circle 
Fort Worth, TX 76102
Phone 817-415-3200
Using Your MP3 Player