Anybest Digital Mini Portable rechargeable Audio Voice 4GB Voice Recorder Dictaphone With MP3 Player and USB Connection Support MP3, WMA, MP1, MP2 Format, WAV Format Recording (4GB, Silver) With MP3 Player and USB Connection Support MP3, WMA, MP1, MP2 Format, WAV Format Recording Recording format:WAV. Voice Operated Recording (VOR):When record option is selected, press the Menu button to access the Voice Activated Recording (VOR) function. 7 EQ (Equalizer) modes, A-B repeat function, MP3 function, Different languages, Delete function, USB connection, for uploads and downloads. Built-in speaker, Built-in rechargeable lithium battery, Battery life expectancy: Up to 20 hour continuous recording, Up to 13 hour continuous playback. Great for conferences, meeting, lectures, classes, and many other events.