VideoSecu CCTV RCA Audio Mic High Sensitive Security Camera Microphone w/ Power Supply A91 Specifications: •RCA for audio output •2.1mm center + DC plug for power input •Monitor range: 60sqf - 1600sqf •Frequency range: 300 - 5kHz •Current consumption: 20mA •Output level: 0 - 6V •Power supply: DC 6V - 12V Package Contents: (1) Mini Microphone, (1) Power Supply and (1) Security Warning Decal