From the Manufacturer
MP3, WMA, or FM. Get 'em all with the irock! 830. 128 MB of built-in memory stores up to 4 hours of music. FM tuner with 20 presets provides unlimited radio listening. Up to 30 hours of playback on one AA battery. Includes carrying case, neck strap, battery, USB cable, high-quality earbuds and software for PC and Mac.
The 830 featires skip-free playback of MP3 and WMA files, high-quality stereo FM Tuner with 20 presets. Plus it plays up to 30 hours on one AA battery and is PC and MAC compatible.
MP3, WMA, or FM? Get 'em all with the irock! 800 Series. With up to 30 hours on one AA battery, 4+ hours of music storage, and endless FM radio, your ears will thank you.