Which of the following protection devices is used for spot protection within a few inches of the object, rather than for overall room security monitoring?

Question

Options

• AWave pattern motion detectors
• BCapacitance detectors
• CField-powered devices
• DAudio detectors

• A
  7% (1)
• B
  87% (13)
• D
  7% (1)

Explanation

Capacitance detectors work by creating an electrostatic field around a specific object (like a safe or cabinet), triggering an alarm when that field is disturbed by proximity - making them ideal for "spot protection" within inches of the protected item, not broad area coverage.

• Wave pattern motion detectors (A) fill a room with microwave or ultrasonic energy and detect movement across a wide area - the opposite of spot protection.
• Field-powered devices (C) are passive RFID-style devices that draw power from an external field; they're not a security monitoring technology in this context.
• Audio detectors (D) pick up sounds (glass breaking, drilling) across a room or zone, making them area-based, not object-specific.

Memory tip: Think of capacitance as "cap" - like a cap placed tightly over a single object. If anything gets close enough to touch "under the cap," the alarm fires. It's intimate, object-level protection, not room-wide surveillance.

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