Sony ICD-UX533BLK Digital Voice Recorder - Black Introducing the ideal digital voice recorder for business, school, and/or music recording, delivering ease of use with superior recording and audio playback capability 4 GB of available internal flash memory provides ample space for recording life's important moments-up to 1,073 hours in fact Capture every nuance, distant or low volume, with great clarity via a 2-element stereo microphone array A built-in Memory Card Expansion Slot (microSD/M2) allows for additional recording Automatically adjusts recording levels for optimum results, or when necessary allows for manual control