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CCTV Surveillance Microphone for Security System Small High Sensitivity(CM800)

Features:

Using split block design, easy to install and dismount.
Built-in imported chips, high sensitivity, beauty voice. 
Power polarity protection circuit, built-in surge protector
Using echo eliminate technology, effectively reduce the echo.
For installation in police stations, courts, meeting rooms, interrogation rooms, banks, etc.
Pickup range:  10~100m²
Working voltage:  12 V DC regulated power, Electric current: 20mA
Transmission distance:  up to 3000 meters
Sensitivity:  -35db
Signal Noise Ratio:  70db
Frequency response:  20Hz to 20KHz
Weight:  75g, Size:80mm*80mm*27mm