BoomGear MP-900 256MB MP3 Player/SD Slot/FM Tuner/Voice Recorder 256 MB of memory for over 4 hours of MP3 or 8 hours of WMA music Built-in FM Tuner,FM Recorder, Voice recorder Cell Phone pass through for hands-free talking while listening to music Secure Digital card/MMC expansion slot provides up to 512 MB of additional memory 20-hours of continuous playback with one AAA battery