Hello, Katie -
I have not yet found any information on a Naxa NX-104 MP3 player. What I have found is information on Naxa MP3 players with the model numbers NM followed by a number (but not 104.) Do you have the model number right?
The information I have found on the Naxa MP3 players is that they come with earphones. Did your MP3 player come with earphones when you purchased it? It should have, if you purchased it new.
I suggest you contact Naxa Customer Service directly and ask if you can purchase replacement earphones for your model of MP3 player. This is the link to the Naxa Electronics Contact Us web page:
http://www.naxa.com/contacts
Best wishes.
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