One add-on mini audio box for all Camera which need audio function
High Sensitive microphone and 12V power regulator built-in box
Plug & Play 
Extremely Sensitive 
Great for Security Monitoring 
Higher S/N Ratio 
Range : 150 Square metres 
Audio Output: RCA Female 
Sensitivity : 200mA/ubar 
Work current :5 mA-60mA 
Work Voltage:4-14V 
Frequency:200-6000HZ 
Max output Voltage:5V-upp