Features: 1. Built-in time chip with automatic time synchronization function, enabling efficient document browsing and organization 2. Equipped with a high-energy lithium polymer battery to support extended recording sessions 3. Automatic power failure protection: when low power is detected, the device automatically saves recordings and shuts down to prevent data loss 4. Compact and lightweight design for easy portability 5. Supports OTG connection to smartphones for convenient file transfer 6. Strong magnetic back for secure attachment and reduced risk of loss Parameters: 1. Shell material: CNC aluminum alloy 2. Battery capacity: 120mAh 3. Recording mode: auto-record on boot, auto-save on shutdown 4. Recording format: WAV 5. Playback formats: MP3, WMA, WAV 6. Sampling rate: 48kHz 7. Recording bit rate: 192kbps 8. Charging time: approximately 1 hour; recording time: up to 18 hours; playback time: up to 12 hours 9. Memory capacity and recording time: 4GB: up to 48 hours 8GB: up to 96 hours 16GB: up to 192 hours 32GB: up to 384 hours 10. Dimensions: 29 x 29 x 7.6mm 11. Weight: approximately 9.7g