Built-in Memory - 4GB Built-in Microphone - Monaural Recording Format - HVXC/MP3 Playback Format - HVXC/MP3 Maximum Number of File - 495 Maximum Number of Files in one Folder - 99 Battery Type (Provided) - Dry Battery ( Alkaline, Size AAA ) Recording Low-cut Filter - Yes Add/Overwrite Recording - Yes VOR - Yes Recording Monitor - Yes Max. Recording time MP3 8kbps (monaural) - 1043 Hrs 0 Min Max. Recording time MP3 128kbps - 65 Hrs 10 Min Max. Recording time MP3 192kbps - 43 Hrs 25 Min Battery Life for recording HVXC 2kbps (monaural) - 30 Hrs Battery Life for recording MP3 8kbps (monaural) - 45Hrs Battery Life for recording MP3 128kbps -28 Hrs Battery Life for recording MP3 192kbps - 26 Hrs Frequency response HVXC 2kbps (monaural) - 100 - 3,000 Hz Frequency response MP3 8kbps (monaural) - 75 - 3,000 Hz Frequency response MP3 128kbps - 75 - 15,000 Hz Frequency response MP3 192kbps - 75 - 15,000 Hz Playback & Edit Digital Pitch Control (Speed Control) - Yes Noise Cut - Yes Easy Search - Yes Alarm Playback - Yes Erase - Yes Protect - Yes Divide - Yes Move File - Yes Interface Input and Output Terminals - Headphone Jack, Microphone In Specification Dimensions (W x H x D) - 38 .5 x 115.2 x 21.3 mm Weight - 72g