VideoSecu High Sensitive Preamp Microphone Audio Pickup Device Sound Voice Pickup Kit with 100 Feet Cable and Power Supply WUH Super high gain mini microphones capturing audio evidence. This microphone is compatible with devices that accept AV input, like TV, VCR, DVR Preamplifier used to increase a microphones low output voltage to a stronger usable level 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 Package included: 1 x preamp microphone, 1 x 12V DC 500mA power supply and 100ft extension cable