A specially constructed microphone attached directly to an object or surface to be protected, which responds only when the protected object or surface is disturbed, is known as:

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Quizplus · Accepted Answer

A contact microphone is designed to directly pick up vibrations and sound waves from the surface it is attached to, making it ideal for detecting subtle movements or disturbances on a specific object or surface. Parabolic microphones are typically used for long-range surveillance, while special audio or surreptitious microphones are designed to be hidden or disguised.

A Specially Constructed Microphone Attached Directly to an Object or Surface