The portable cassette tape player can be converted into MP3 digital files without using a PC, using a USB flash drive to convert MP3 format with one click and save it directly to a USB flash drive. You just put the tape in and play, press the record button and wait. After all songs are played, it automatically saves the audio on the tape side as an mp3 file on a USB flash drive. There will be separate files for song tapes. It has automatically split songs. Then you just have to turn the tape back and do the same thing and record the song on the other side to your USB stick.