Which type of detector typically causes a high number of false alarms?

Motion detectors are known for having a higher tendency to generate false alarms, and this can be attributed to several factors inherent in their functioning. They typically work by detecting movement within a specified area using various technologies, such as passive infrared, microwave, or dual technology, which combines both methods.

The sensitivity of motion detectors can lead to false alarms triggered by non-threatening movements. For example, pets, small animals, or even changes in environmental conditions, such as wind moving branches or curtains, can be misinterpreted as intrusion. Additionally, the area of coverage for motion detectors is often extensive, meaning that irrelevant motion within that zone can lead to multiple false alerts.

In contrast, other types of detectors, such as window sensors and door sensors, typically trigger alarms based on a direct action (like opening a door or window) and are less likely to respond to minor movements or environmental changes. Glass break detectors, while potentially sensitive, are focused on specific frequencies generated by breaking glass rather than generalized motion, thus reducing the chances of false alarms.