Works as voice recorder, MP3 player, and USB drive. Onekey to record and onekey to save audio. Realtime monitoring during recording and hearing aid function. Product features: Onepiece shell design for durable, antifall protection. Automatically timestamped recording files with datebased automatic naming. Detects low battery and automatically saves recording files before power off. Benefits and practicality: Allinone device reduces equipment clutter: record, listen to MP3s, and store files via USB. Simple twobutton operation enables quick recording and saving with minimal setup. Clear file management with automatic datestamped names helps organize recordings and playback. Use scenarios: Inclass lectures or seminars: press one key to start recording, monitor in real time, and later review the session as MP3 playback; files are saved with datebased names automatically. Business meetings or interviews: realtime monitoring helps ensure audio quality, and if power runs low, recordings are saved automatically to prevent data loss. Field work or data collection: use as a USB drive to transfer and back up audio files; timestamped names keep recordings organized by date for easy archiving.