The sensor features a single relay contact that can be wired to alert a control system, trigger an alarm, or close a valve to halt the flow of liquid. It has easy to read green/red “traffic light” ...

A failing oxygen sensor will usually trigger your car’s check engine light. The oxygen sensor (sometimes ... An aftermarket alarm system can wreak havoc on your car—and consequently make ...

But in almost all cases, you want a presence sensor instead. The one I'd want is the FP300, which Aqara released today at CES 2025. Motion sensors are triggered by light changes. As people cross a ...