The unit provides 4GB of built-in memory, but this is expandable via the microSD card slot. A calendar-search function renders finding your files a straightforward task. The audio quality of recording is served by a low-cut filter for eliminating extraneous noise and rumble, as well as Auto Voice Recording mode, an S-microphone system, and adjustable options for capturing stereo or mono sources at close range and at a distance. The included AAA battery enables the unit to last for up to 55 continuous hours. Sound Organizer software for Windows is also included