Sony Professional 4GB Digital Flash Voice Recorder Built-in 4GB flash memory - 4 GB of available internal flash memory provides ample space for recording life's important moments-up to 1,073 hours PC and Mac compatibility - Transfer files quickly and easily with the supplied USB cable. Works with Windows as well as Macintosh computers Intelligent Noise Cut - Intelligent Noise Cut, a unique and innovative technology from Sony, significantly reduces ambient noise during recording for clearer playback Track Mark - 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 Battery Operated - Two AAA batteries (included) will deliver up to 96 hours of recording time so you will never miss a beat