YANS YS-M21W USB Mini Port Video Conference Omnidirectional Microphone 1. Using USB 2.4G wireless digital signal driver-free design, built-in high-power HIFI-level audio speakers 2. 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 3. Built-in 1 omnidirectional high-sensitivity dual-condenser 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 at ease in a multi-person meeting. Position, no need to be particularly close to or move the omnidirectional microphone 4. Suitable for all kinds of video conferencing and instant messaging software, plug and play 5. Built-in a 3.5mm mobile phone audio interface, you can connect the mobile phone with YS-M21W, it is very convenient to conduct conference calls; and has the HIFI music function, after pressing the HIFI button, the speaker immediately switches to 48Khz mode, so that the music can be restored more realistic 6. 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, calculation, so that software video conferencing applications can be obtained Clear and clean voice communication quality 7. Built-in 3.7V-2500mAh lithium battery, working time is more than 8-10 hours under fully charged state 8. Compatible with USB 1.0 & 2.0, driver-free design 9. Equipped with intelligent two-color led lights, which can easily display the status of each function 10. Speaker sampling frequency: 24Khz-48Khz, microphone sampling frequency: 16Khz 11. Operating voltage: 4.5V-5.5V 12. Sensitivity: -34 +- 3 dB 13. Frequency: 100-10,000 Hz 14. Output impedance: less than or equal to 2.2 kiloohms 15. Sound pressure level: 115dB 16. Signal to noise ratio: gre