Automatic reverse function The device features an automatic reverse mechanism that flips the cassette and reverses playback quickly. You can set it to reverse once or loop indefinitely for uninterrupted listening or recording. USB formatting Format the USB drive to FAT32 for compatibility. This helps avoid issues when burning or reformatting original files and ensures reliable data transfer and playback from the device. Plug and Play Plug and play: convert audio cassette tapes to MP3 format and play MP3 files from a USB flash drive. The unit supports easy digitization of cassettes and convenient USB playback. AC/DC power supply Operates on 2 x AA batteries or USB power. If you are using USB power, remove the batteries for convenience. Use scenarios - Digitize a cassette collection: connect a USB drive, convert tapes to MP3, and store the files on the USB drive for digital archiving. - USB playback: insert a USB flash drive containing MP3 files and use the device as a portable audio player. - Flexible power options: power from USB on a desk or via batteries when on the go, with batteries removed if USB power is used.