Macvision MA823T-2BL Black 256MB MP3 Player Lightweight multi-format digital audio player in black with LCD 256 MB memory holds 4 hours of MP3 and 8 hours of WMA audio Built-in FM radio with 40 presets, voice recorder, USB mass storage, seven-setting equalizer Up to 10 hours of battery life with single AAA battery Compatible with Windows, Mac, and Linux operating systems