Guard911 is a panic button app. In the event of an active shooting emergency, a user presses the main Guard911 panic button. An alert is immediately sent to the smartphones of all federal, state and local, ON and OFF duty, law enforcement officers who are in close proximity to the location and who belong to the Hero911 Network.

Additionally, an intra-location alert is simultaneously sent to the smartphones of all users and a mapped location of the initial alert is displayed (mapping depends on cell coverage). Guard911 also alerts all other protected locations within a 5 mile radius of the initial alert.