One-key recording & A/B repeat function: press REC to record, one-key to record, one-key to save. It supports built-in/external microphones. The USB rechargeable voice recorder can help you learn the language and review the lesson from the selected starting point A to the end point B. You no longer need to go back or forward to listen to words.Portable and USB charging: The portable recorder is so small that it can fit in almost any pocket. This voice recorder can be used to record various important audio files and can be used as an MP3 player. Built-in lithium-ion battery, which can be directly charged via PC USB or DC 5V output adapter.Wide range of uses: The external microphone of the portable recorder can be used in meetings, interviews, lectures, classrooms and other occasions. It is an excellent gift for students, teachers, professors, scholars, writers and businessmen.