4 GB of available internal flash memory provides ample space for recording life's important moments-up to 1??073 hours in fact</br>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</br>A built-in Memory Card Expansion Slot allows for additional recording time via removable flash memory</br>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.</br>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 "ed" to for playback</br></br>Product Description</br></br>Introducing the ideal digital voice recorder for business?? school?? and personal recording?? delivering Sony's legendary ease of use with superior recording and audio playback capability. The <b>Sony ICD-PX333</b> Digital Flash Voice Recorder has 4GB of internal flash memory and can record up to 44 hours of mono audio in 192 kbps MP3 quality. Additional storage can be provided via its microSD memory slot and optional memory cards. The ICD-PX333 has an Intelligent Noise Cut which is designed to automatically reduce ambient noise during recording. The A-B Repeat function allows you to set a beginning and end of a passage for looped playback. It is powered by the 2 AAA batteries. <br> <br> ***Specifications:*** <br> <b>Operating System Compatibility:</b> Windows?? 8 Windows?? 7 SP1 or higher?? Windows Vista?? SP 2 or higher?? Windows XP SP3 or higher Mac OS X (v10.3.9-v10.8)?? pre-installed <br> <b>Recording System:</b> Digital?? Monaural Recording: <br> <b>Microphone:</b> Built-in?? unidirectional microphone <br