VideoSecu Microphone High Sensitive Preamp Audio Mic Sound Voice Pickup Device Kit with Extension Cable and Power Supply BPK Built-in on board IC preamp, low noise, high gain and auto level adjustment Pick up every sound with this super high gain micro audio system. This microphone is compatible with devices that accept AV input, like TV, VCR, DVR Preamplifier used to increase a microphone's low output voltage to a stronger usable level Super high gain mini microphones capturing audio evidence Package Includes: 1 x Preamp Microphone, 1 x 12V DC 500mA Power Supply, 1 x 100ft Video Power Cable and 1 x Security Warning Decal