Air alarms, for example, require you to tell it which vents, scrubbers, sensors, and firelocks to interact with.
## Linking
If a device, basic or advanced, needs finer controls of how and which devices it connects to, it will generally use device linking.
<Box>
<GuideEntityEmbedEntity="SignalSwitch"/>
<GuideEntityEmbedEntity="Airlock"/>
</Box>
With linking, you can connect the outputs of a device, like [color=gray]On[/color] or [color=gray]Off[/color], with the inputs of a device, like the airlocks [color=gray]Open[/color] or [color=gray]Close[/color] inputs.