Which type of switch responds to proximity?

A proximity switch is a device that detects the presence of an object without requiring physical contact. It responds to the proximity of an object, such as a finger or other triggering mechanism, by utilizing an electromagnetic field or some other form of sensing technology. This allows for activation without the need for pressing or physically touching the switch, making it particularly useful in accessibility devices and applications where hands-free operation is advantageous.

In contrast, the other types of switches listed require some form of physical action or contact to operate. Pneumatic switches rely on air pressure to activate, paddle switches require being pushed or pressed, and wobble/leaf switches also necessitate a physical movement. Thus, the proximity switch stands out as the correct choice due to its unique ability to function based solely on the closeness of an object rather than direct interaction.