Portable MP3 players

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• Storage medium (Storage medium type)
  MP3 Players can use either flash memory or hard disk drive (HDD) to store the MP3 music files. Flash memory is a non-mechanical solid state technology, and therefore it is lighter and more power efficient than HDD. Flash is also more resilient to such hazards as dropping or fragmentation. On the other hand, HDD offers more storage capacity than flash memory: flash-based players only offer storage capacity up to 32 gigabytes (GB), while HDD players reach up to around 250-300 GB.
• Headphone jack (Headphone jack type)
  The headphone jack most commonly used is 3.5 mm in diameter. Sometimes a smaller 2.5 mm jack is also used, which saves space. The downside is that most headphones are equipped with a 3.5 mm plug and require an adapter to fit into the 2.5 mm jack. Some manufacturers also use their own proprietary jacks.
• PC connection (Computer connection)
  The player is usually connected to a computer via an USB or FireWire-cable. Quite often, however, the player end of the cable requires a special connector designed by the manufacturer.