SIZHENG COTT QD28 Fidelity audio monitoring security accessory for voice pickup in CCTV Microphone from Security Protection

SIZHENG COTT QD28 Fidelity audio monitoring security accessory for voice pickup in CCTV Microphone from Security Protection
SIZHENG COTT QD28 Fidelity audio monitoring security accessory for voice pickup in CCTV Microphone from Security Protection

Product Specification

Brand Name: SIZHENG

Model Number: COTT-QD28

Use: Audio surveillance for security solutions

Sound Monitor Range: 5-100 Square meters (adjustable)

Frequency : 20Hz~20KHz

Sensitivity: -40dB

Output Impedance: 600 ~1000Ω non-equilibrium

Power Supply : DC10V-18V (recommend to use 12V, more than 500 meters recommended 15V)

Working Current: 50mA

Working Environment: -25℃~70℃

Product Size: 80*36(mm)

Product Weight: 41g



SIZHENG COTT-QD28 Fidelity audio monitoring security accessory for voice pickup 

 Key Features of SIZHENG QD28 cctv audio microphone 

1:Fidelity Sound Pickup,designed for audio monitoring, the advantages of large monitoring range and high sensitivity.

2:Gold-plated vibration membrane microphone, 5~100 square meters in high fidelity, high sensitivity, high bandwidth and low noise.

3.Built-in AGC and DTS noise reduction signal processing circuit, automatically adjust high strength voice and instantaneous impact sound.

4.Built-in newest DNP and DSP digital processing unit, completely eliminate "hiss" electronic noise.

5:Equipped with high-pass filtering noise reduction circuit, effectively reduce the high frequency and low frequency noise of environment and circuit.

6.Long audio signal transmission technology, Long audio signal transmission technology,use the RVVP3 x 0.5mm2 shield cable, it is distortionless within 3km.

7.Widely used in television broadcasting, TC Teleconference, classrooms and any indoor places need to video audio monitoring.

 Specifications of SIZHENG QD28 cctv audio microphone 

Items Performance Metrics
Audio Monitor Range 10-100 square meters (adjustable)
Audio Transmission Distance  3000m
Frequency Response 20Hz~20KHz
Sensitivity -40dB
SNR 80dB(1m40dB) 60dB(10m40dB) 1KHz at 1Pa
Directional Property Omnidirectional
Dynamic Range 104dB (1KHz at Max dB SPL)
Max Sound Pressure 120dB SPL (1KHz,THD 1%)
Output Impedance 600 ~ 1000Ω non-equilibrium
Signal Amplitude 2.5Vpp/-25db
Microphone  Gold-plated vibration membrane microphone
Microphone Quantity 1pcs
Signal Processing Circuit DSP,AGC,ALC
Protective Circuit Lightning protection, power supply polarity reverse connect protection,
ESD protection
Connection Way 3 leading wires
(red lead is power+, white lead is audio signal+, black is power-&audio signal-)
Transmission Cable RVVP3*0.5mm2 shield cable
Supply Voltage DC10V~18V 
(recommend to use 12V, more than 500 meters recommended 15V)
Working Current 50mA
Housing Material Advanced resin PVC+Spray diffusion coating
Color White
Weight 41g
Product Size 80mm*36mm
Approvals CE,ROHS,FCC, ISO9001
Place of Origin Guangzhou, China


 Product Photos                                        





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1.We will send the goods within 7 working days after your payment is verify by Aliexpress.

2.Our free shipping only included China post air mail, and the weight should be within 2KG. Please notice the China post air mail are slowly. If the weight over 2KG, you should responsible for the shipping cost.

3.If you want to send by EMS, DHL and UPS, you should pay for the shipping cost.

4.You will trace the goods online after sending the goods 3-7 working days.

5.Please check your goods on the shipping company when you receive the goods.


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