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Product Description Features: High Sensitive microphone Built-in DC power output port The installation of hidden Power polarity protection circuit Interface DC+RCA Specifications: Model:TQ-601A Extremely Sensitive Great for Security Monitoring Higher S/N Ratio Range:50-80 Square meters Sensitivity : 5mA/ubar Work current : 5 mA-60mA Work Voltage: DC9-15V Frequency: 100-10Khz Max output Voltage: 6V-upp Package: 1 X CCTV Audio Microphone