In property selects a controller Digital Input (DI) or Supervised Digital Input (SDI) as the initiating event. The Active Threat Level property defines what active level the threat level group changes to when the input is active.
The input triggers a specific threat level. You would set up one input for a lockdown, and another input for the all clear.

For example, imagine a duress or panic device located near a reception desk. When someone activates the device, it sets the threat level of the associated threat level group to a high level, such as 10 or higher. An activation badge, Boolean input, or command from the console can be used to reset the threat level group back to normal.