CCTV Surveillance Microphone for Security System Small High Sensitivity(CM30)

Features:

Built-in AGC circuit, pure sound, low noise and high fidelity, Adjustable sensitivity.
Power polarity protection circuit
Voltage:  9-12VDC, Electric current: 20mA
Frequency range:  100-100 KHz
Output impedance:  600 ohm non equilibrium
Pickup range:  5~100m²