"Noise Eliminator" Micrphone Durable, noise eliminating microphone for use with the Model 777 Leak Detector Easy to use accessory for leak detection in high, outside noise situations Engineered to improve success during difficult conditions: PVC pipe, through asphalt or pavement, and water filled cavaties Designed for "stand-up" operation Will effectively muffle outside encompassing noise, such as; wind, construction, and vehicle traffic Will plug into any Goldak Model 777 Leak Detector!