Anybest PRO REC LCD 40hr Battery Life PCM Digital stereo recorder USB Voice Recorder Pen with Sensitive Voice activated function (4GB) Voice Activated recording (Sensitivity adjustable LO/HI);Recording light can be turned off for secret recording. Support multiple audio format, such as MP1, MP2, MP3,WAV;USB2.0, no drive needed for Win XP/VISTA/WIN7, OS 10.X or above. Volume Adjustment in 20 levels;.mp3 player function. Built-in Speaker;USB2.0, fast connect to computer. Recording monitor:listen to on-going recordings via earphone