Automatic date based timestamp and file naming: recordings are saved with the date in the file name for easy organization and retrieval. Autosave on low battery: when a low battery is detected the device saves the current recording automatically before power off, reducing the risk of data loss. Durable one piece shell: single piece construction provides strong anti fall protection and lightweight portability. Real time audio monitoring and hearing aid function: listen to the recording as it happens and take advantage of the built in hearing aid function for enhanced listening. Multifunction device: works as a voice recorder, MP3 player, and USB drive. one key to record and to save audio for quick operation. Compact and portable design: easy to carry for daily use, meetings, interviews, and on the go. Use scenarios Field interviews and meetings: date stamped filenames improve filing and search, and auto save protects work if power runs low. Lectures and classes: real time monitoring helps verify audio quality during capture, while the device also serves as a convenient MP3 player and USB drive. Travel and everyday use: serves as a compact recording device, a portable MP3 player, and a USB storage drive, with simple one key control for quick recording.