VideoSecu 4 Pack Audio Pickup Device High Sensitive Preamp Mini Mic Microphones Sound Voice Collecting and Free Warning Decals WF8 Collect audio evidence as important as capturing video evidence. This microphone is compatible with devices that accept AV input, like TV, VCR, DVR A combined power and audio cable are included with the microphone Preamplifier used to increase a microphone's 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 the super high gain micro audio system