R-Tech RCA Microphone Audio Cable with Amplifier (for CCTV Security Surveillance Cameras) &ndash; 1ft &ndash; 12VDC High-sensitivity audio microphone (external) with built-in amplifier Audio Connector: RCA Female Power Connector: DC12V Female Power Pass-Through: DC12V Male (5.5mm x 2.1mm) Length: 12 inches (1 ft)