Fangrui Product Details 1. Zd70 Smart Hd Noise Reduction Voice Control Recording Pen 2. Display: 1.44 Color Screen 3. Speaker: 23 Speakers 4. Headphone Interface: 3.5pie Stereo Jack 5. Distortion Rate: About 70db 6. Signal-to-noise Ratio: 0. 7. Recording Format: Wav Format 8. Recording Power: 8-20ma 9. Recording Acquisition Rate: 16-48khz 10. Recording Bit Rate: Mp3, Wav 11. Usb Interface: Type-cdc5v-1a 12. Tf Card Capacity: 4gb-128gb (not Included In This Product) 13. Battery Capacity: 500mah 14. Recording Save: One File Is Saved Every 1 Hour By Default 15. Continuous Working Time: About 50 Hours Of Recording, About 50 Hours Of Headphone Playback 16. Audio Playback Time: About 10 Hours Of Continuous External Playback (determined By The Volume) 17. Support System: Windows Xp&vista2kme98 (need To Install Driver)mac Oswindows 7 Windows10 18. Omnidirectional, Stereo Directional Recording 19. 1536kbps, High-definition Lossless Sound Quality