Digital Voice Recorder. 4GB of internal memory allows you more than a thousand worry-free hours of recording time, with microSD card compatibility that extends it to 512MB-16GB. Edit your files with Olympus Sonority software, which is compatible with PCs and MACs. Record and play back in MP3, WMA and PCM formats with a quality that?s as good as its operation is easy. * Micro SD card compatibility. * Dont let old memories of battery drain your confidence. There is up to 51 hours of recording capability with the DM-520's super-long-life battery. And the battery can be charged when you hook the recorder up to your computer via the USB port. * The ultra-high quality stereo microphone provides superior performance. * Increase your playback ease with a scene selection playback function. * Download podcasts automatically. * PC downloads via USB are conducted with 2.0 high speed capability. * Move and copy files between internal memory and the micro-SD card with ease. * Be a pro with the optional tie-clip microphone. A telephone recording device is another handy option. * A voice guidance system ensures seamless, user-friendly operation of all functions in the menu. * Built-in VCVA (Variable Control Voice Actuator) is another hands-free function that adds ease and practicality.