YANS YS-M21 USB Mini Port Video Conference Omnidirectional Microphone . Using 256ms echo cancellation algorithm, built-in voice automatic gain balance (ALC) function, no matter how far away the speaker is, the sound can be picked up clearly 2. 360-degree omnidirectional high-sensitivity dual-capacitor microphone, effective diameter of 6-12 meters, no dead spots within 20-60 square meters, free to walk around when one person is in a meeting, and everyone can sit in their own place at a multi-person meeting No need to get close or move the omnidirectional microphone 3. Built-in high-performance intelligent DSP chip, input and output audio directly on the chip for high-speed calculation processing, not only can effectively block noise, eliminate echo, high-speed processing 16K-24K audio sampling and calculation, so that software video conferencing applications can be obtained Clear and clean voice communication quality 4. The design of hands-free speaker microphone makes it easier for users to participate in software video conferences or use instant messaging software 5. Compatible with USB 1.0 & 2.0, free drive design 6. Speaker sampling frequency: 24Khz 7. Microphone sampling frequency: 16Khz 8. Operating voltage: 4.5V-5.5V 9. Sensitivity: -34 +- 3 dB 10. Microphone frequency: 100-10,000 Hz 11. Output impedance: less than or equal to 2.2 kiloohms 12. Signal to noise ratio: greater than or equal to 58dB 13. Sound pressure level: 115dB 14. Compatible system: Windows8windows7vistaxp2000Mac10.5Android 15. Size: 325x340x64mm, weight: 650g 16. Cable length: 5m 17. Packing list: omnidirectional microphone, USB high-speed audio cable, manual, certificate of conformity, warranty card