The Sansa Shaker features many ways to listen to and share songs. It has a built-in speaker to enjoy music without ear buds, to play your favorite music, and listen with your friends & family. Plus it comes with two headphone jacks. You also have the ability to play and share SD cards loaded with your favorite songs. (A SanDisk SD Memory card is included) Changing songs on the Sansa Shaker is a snap - or rather, a ?shake?. You can impress your friends by shaking the device to jump to the next song, or use the colorful controller bands for forward and backward changing as well to manipulate volume. The Sansa Shaker is available in a choice of colors, and comes equipped with a USB cable, lanyard, pre-loaded songs, and a colorful array of stickers so kids can customize their device. An AAA battery is included which allows up to about 15 hours of music life when using headphones.