A specially constructed microphone attached directly to an object or surface to be protected and that responds only when the protected object or surfaced is disturbed is known as a:

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A contact microphone is the type of microphone that is attached directly to an object or surface to be protected and responds only when the protected object or surface is disturbed. This type of microphone is often used for security purposes to detect any attempts to tamper with or damage the protected object or surface.

A Specially Constructed Microphone Attached Directly to an Object or Surface