C20 HD Intelligent Noise Reduction Mini Recorder With OTG Features: 1. High-definition sound quality, restore the real sound 2. Intelligent noise reduction, using smart chip, good performance, low power consumption, isolate 500 kinds of environmental noise 3. With OTG, you can directly connect to the mobile phone to listen to the recording 4. Automatically save when low power to prevent file loss 5. Name in time format when recording, convenient for organizing and finding files 6. Ergonomic one-handed operation design, easy to use Product parameters: 1. Chip: Action 2157 2. Input voltage: 5V 3. Working current: 6mA-7mA 4. Recording format: MP3WAV 5. Number of recording files: 999 6. Memory card type: TF card 7. Number of microphones: bidirectional 8. Interface: Type-CUSB-C 9. Battery capacity: 300mAh 10. Charging time: about 3 hours 11. Recording time: about 45H 12. Playback time: about 40H 13. Switch position: 2nd gear 14. Product size: 60 x 35 x 12mm 15. Product net weight: 70.4g Packing list: -Recorder x 1 -Wired headset x 1 -Data cable x 1 -Lanyard x 1 -Instruction manual x 1