20 Most Recent Mach Speed Eclipse V415 (4 GB) MP3 Player Questions & Answers

Look at your headphone first, are they working on another device? If yes, the problem is really the jack. You can change it but needs solder. Bring the player to a tech or to your seller.

Check your users manual and see what format you need for your MP3 player to work, once you have done that, then if you need to change your songs to the format needed to operate the MP3 player you can convert them with a media converter
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You can download a FREE media converter at this website: http://www.formatoz.com/

The website for Mach Speed may be dead - the brand is out of business.

Yes, they are not compatible. MP3 players only work with certain file types, like MP3. Convert your audio book files to MP3 on the computer then put them on the MP3 player.

make sure the MP3's are not "protected" and also verify you have the right folder structure for the player to see them.

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To charge the player, simply connect it to a powered USB port, or external AC adapter. If you choose to use a third party adapter, please ensure that it is 5V and between 350 and 1000 mA , or 1amp amazon has Excelity AC-DC 5V 1A Wall Charger Power Adapter with Plug 5.5 x 2.5mm / 5.5 x 2.1mm $9.00 Personally i would use computer charging for USB ports.

http://www.eclipsemp3.com/180G2.pdf