Customers were previously able to trigger a lockdown with a wired panic button, but a connection to Command was required for the lockdown to propagate across multiple access controllers. 

Now, access controllers are able to communicate peer-to-peer across the local network, allowing the lockdown to be fully enacted across local access controllers even when internet connectivity is lost. The lockdown response can also include one or more AUX outputs, such as strobes or sirens.

Read the full announcement.