Timestamped file names: Recordings are automatically named by date with a timestamp, keeping files organized without manual naming. Low battery auto save: The device detects low battery and automatically saves the current recording before power off to prevent data loss. Multi function device: Works as a voice recorder, MP3 player, and USB drive. One key to start recording and one key to save audio for quick operation. Durable design: One piece shell provides strong anti fall protection for reliable use in everyday situations. Real time monitoring and hearing aid function: Allows monitoring the recording in real time and includes a hearing aid function for assisted listening. USB file transfer: As a USB drive, recordings can be easily transferred to a computer for storage or sharing. Use scenario: In meetings or interviews, capture complete discussions with dated, timestamped files and automatic save on low battery. Use scenario: In classrooms or lectures, record lectures for later review, play back as MP3, and transfer files via USB drive. Use scenario: For notes or language practice, carry a portable recorder for quick, reliable audio capture with the hearing aid function supporting listening in noisy environments.