1. Circular high-definition digital noise cancelling microphone specially designed for public security, procuratorial and judicial purposes Designed for synchronous monitoring of environments such as exam recording and broadcasting.

2. Adopting advanced capacitor gold-plated microphone head with high fidelity, high sensitivity, and low noise within 5-100 square meters.

3. HS dual core digital noise reduction core, ATDA dynamic noise level detection, adaptive bandpass filtering.

4. Exquisite low-noise circuit wiring, stable and reliable industrial components, and comprehensive capture of complete and clear voice sound.

5. Equipped with a unique electronic noise dynamic closed-loop suppression circuit, it completely eliminates the "hissing" electronic noise.

6. The microphone is equipped with lightning protection, power polarity reversal protection, and power protection modules

7. The unique slider structure of the hanging tenon design base is easy to install and disassemble, making it convenient for ceiling or side wall installation.

8. It has a sharp forward sensitivity, built-in micro adjustable potentiometer, built-in LED working indicator light, colorful structural design, and can be installed in various environments

9. Ultra long audio signal transmission technology, using RVVP2 × 0.5mm2 shielded cable to transmit 3 kilometers without distortion.

Working in an ultra high ambient temperature range of 10-25 ℃ to 50 ℃, ensuring high-quality recording performance in the backend.

11. Integrate professional pre audio amplification processing circuits to directly drive active speakers, hard disk recorders, headphones, and more.

12. Adopt the EU Environmental ROHS Directive 2002/95/EC for construction specifications.

13. Passed the EU CE standard and the highest inspection synchronous recording and video system construction specifications.

14. Tested according to relevant standards of the Federal Communications Commission (FCC) and corresponding system construction specifications.

15. Certified according to the international quality management system standard ISO9001.

16. Obtain the national information technology equipment quality product inspection report.

Pick up range 5-100 square meters (adjustable sensitivity)

High grade capacitive gold-plated microphone with pickup head

Directional characteristics Omnidirectionality

Sensitivity -35dB (1) kHz@94dB  SPL）

Signal to noise ratio 60dB (1) kHz@94dB  SPL）

Distortion ≥ 0.3% (74dB sound pressure, A-weighted)

Maximum sound pressure 120dB (1 kHz ≤ 3% THD, A-weighted)

Frequency response 20Hz~20kHz (1) kHz@94dB  SPL）

Output level 2.5Vpp/(1) kHz@94dB SPL A weighted)

Signal Processing High Definition Audio Processor

Noise reduction capability 10-15 dB (adaptive)

Dynamic range 65dB (1) kHz@94dB  SPL）

Output impedance 600-1000 ohms unbalanced

Protection circuit polarity protection, misconnection protection, lightning protection

Connection method three wire system: power cord (red), audio (white), public ground (black)

3000 meter twisted pair cable for signal transmission, shielded cable (please use shielded cable or transmitter for electromagnetic complex environment)

Power Supply Voltage Linear Stabilized Power Supply DC 9V-15V (12V is recommended)

Electromagnetic compatibility complies with GB 9254-2008

Reliability index MTNF ≥ 80000 hours

Shell material: white+premium PVC+metal circular dot matrix surround