What is a key advantage of infra-red touch screens?

The key advantage of infra-red touch screens is their multi-touch capabilities. Infra-red touch screens utilize an array of infrared emitters and detectors positioned around the screen to detect touch by sensing interruptions in the infrared light beams. This allows for the detection of multiple touch points simultaneously, enabling actions such as pinch-to-zoom and multi-finger gestures, which are essential for modern interactive applications.

This technology enhances user experience significantly by enabling more complex interactions than single-touch screens, making them popular in various settings, including public kiosks and tablets. Furthermore, this capability is not dependent on the material or surface used for touching, unlike some other technologies.

The other options, while addressing features of touch screens in general, do not capture the defining advantage of infra-red touch technology in terms of interaction capabilities.