What technologies make up dual technology motion detectors?

Dual technology motion detectors incorporate two different types of sensors to enhance detection capabilities while reducing false alarms. In the case of option B, the combination of microwave and passive infrared technology is a typical configuration used in these devices.

Microwave technology detects motion by emitting microwave signals and analyzing their reflections off moving objects. This allows for monitoring a specific area for activity. On the other hand, passive infrared technology detects changes in heat levels, sensing the infrared radiation emitted by objects, such as human bodies, within its range.

By combining these two technologies, dual technology motion detectors can more accurately distinguish between genuine threats and non-threatening activity, such as pets or environmental factors, leading to a more reliable security solution. This synergy allows one technology to complement the limitations of the other, thereby enhancing overall effectiveness.

Other options do not correctly identify the commonly used technologies in dual technology motion detectors. For example, combining technologies like passive infrared with laser or pressure sensors does not typically meet the operational needs of a dual technology system, which aims to maximize detection efficacy while minimizing false triggers.