Optex

Optex motion detection
Wired motion detectors for professional systems
Optex makes motion detectors for wired alarm installations, including dual-tech versions that combine passive infrared and microwave. Because both technologies must trigger before an alert is raised, the detector is less likely to react to warm air or moving curtains. There are also versions with a lens that helps limit false alarms caused by pets; how well this works depends on the weight of the animal and the mounting height.