Specialized security guards Surveys, monitors and checks the conditions of the premises thus spotting any suspicious behavior, emergency and preventing problems including illegal activities. They also answer alarms and investigate disturbances in the premises to ensure a conducive environment and the calling the police or fire departments in cases of emergency, such as fire or presence of unauthorized persons. They check the doors and windows of the buildings to ensure that they are tightly closed and locked or noting the unlocked doors/windows and submitting the information to the client/supervisor.