D3 AI Smart High-definition Noise Reduction Voice Recorder, Capacity:4GB 1. One key to turn on the recording mode, easy to operate 2. The automatic zoom microphone system is adjusted to a focal length suitable for capturing marriage to ensure high-definition recording effect 3. After the memory is full, the new recording file will automatically overwrite the very early recording file 4. Built-in time chip, after synchronizing the time with a computer, the recorded time of the recording file can be synchronized with Beijing time, and the recording file is named after the time 5. When the recorder is out of power, it will automatically save files to prevent data loss and ensure safety 6. There is no light or sound at work, and recording can be turned on anytime and anywhere to ensure safety 7. Battery capacity: 500mah 8. Material: zinc alloy 9. Recording time: 3-4 hours 10. Resolution: 1920*1080 11. Recording distance: 60 meters long-distance recording 12. USB interface: mini USB 13. Size: 90x13mm 14. Weight: about 20g