Item Type: Voice Activated RecorderMaterial: ABSFrequency Range: 20Hz-20KHzSignal to Noise Ratio: 90dBSupport System: For Windows 98 ME 2K XP, for WIN7 8 10, for Linux 6.2, for OS X 10Built in Polymer Lithium Battery: 750mAhPackage List1 x Voice Activated Recorder1 x Headphone1 x Manual1 x USB Cable1Portable: The voice activated recorder is card sized, thin and light, easy to carry, suitable for meetings, studies, and suitable for Windows. 2Adjustable: Independent voice activated buttons, scroll wheel volume adjustment to switch tracks. AI intelligent high definition noise reduction. 3Multiple Recording Modes: ADPCM recording 192Kbit, optional voice activated recording 50dB, automatic split recording, loop coverage recording. 4Multifunctional: The sound recording device supports MP3, WMA, WAV playback, and supports fast forward and reverse playback. 5With Recording Files: The recording files of the recorder are named by time, which is easy to find, and the charging time is about 3 hours.