Macvision MA823T-5BL Black 512MB MP3 Player Lightweight multi-format digital audio player in black with LCD 512 MB memory holds 8 hours of MP3 and 16 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