A mechanical security device is defined as which of the following?

A mechanical security device is characterized by its functionality that does not rely on electrical components. This includes items specifically designed to physically secure or restrict access to certain areas or objects. Examples of such devices include traditional locks, padlocks, and other hardware mechanisms that are manually operated to secure doors, gates, or safes.

Choosing a non-electric device for opening and closing secure places aligns with the fundamental definition of mechanical security devices. Unlike electric alarm systems, which rely on electronic components to detect breaches or monitor security, or mobile apps that provide security through technology, a mechanical device functions solely through physical means. Therefore, it is paramount to understand that the essence of mechanical security lies in its simplicity and physical operation, free from the complexities of electronic systems.