New 4GB Digital Voice Recorder 650Hr Dictaphone MP3 Player Rechargeable A-B repeating: repeat a certain part of a music file Deletion function: delete MP3 music files and voice files stored in the device. You can choose to delete a single file or all files. USB connecting, facilitating upload and download of voice files. Built-in Lithium batter, rechargeable, saving your money and worry and protecting the environment. Recording and replaying of recording files