Sony ICD-PX333 Built-in 4GB Flash Memory Digital Voice Recorder with Memory Card Expansion Slot + 8GB MicroSDHC Memory Card + USB Cable + AAA Batteries & HeroFiber Ultra Gentle Cleaning Cloth 4 GB of available internal flash memory provides ample space for recording lifes important moments-up to 1,073 hours in fact Capture thoughts, dictations and other details with great clarity via the built-in microphone. Via an external microphone (available separately). stereo recordings can also be made when necessary A built-in Memory Card Expansion Slot allows for additional recording time via removable flash memory Select a pre-determined recording mode with the push of a button. Automatically the unit will optimize the settings for recording notes, lectures, music etc. Mark the beginning and ending of a particular recorded passage for repeated playback over and over again-perfect for language learning. Finding an exact spot in your recording is a snap. Place up to 98 track marks in each recorded file which can be "jumped" to for playback