With a size and shape small enough to make it a suitable keychain accessory, the Coby 512 MB Sports MP3 player is an optimally portable music player for both marathon-length runs and road trips across the country. Measuring less than 4 inches long and less than an inch wide, and only 3.2 ounces, the player can be easily carried in a shirt or pants pocket, and can hold up to 125 of your favorite songs. In addition to music files, the player supports a mass storage mode, making the player a handy tool for carrying important school and business files. As an added school/business feature, the player comes with an integrated microphone, allowing you to record those important lectures or meetings in MP3 format. MP-C556 MP3 player, 1 AAA battery, stereo neck strap earphones, USB cable, arm band, and installation CD.