A1 and A4 1) Patrol industrial and commercial premises to prevent and detect signs of intrusion and ensure security of doors, windows, and gates.2) Answer alarms and investigate disturbances.3) Monitor and authorize entrance and departure of employees, visitors, and other persons to guard against theft and maintain security of premises.4) Write reports of daily activities and irregularities, such as equipment or property damage, theft, presence of unauthorized persons, or unusual occurrences.5) Call police or fire departments in cases of emergency, such as fire or presence of unauthorized persons.6) Circulate among visitors, patrons, and employees to preserve order and protect property.Professional security guard and Security patrol officer.Surveillance rounds by foot or vehicle. Acute knowledge of Fire panels and Fire prevention.Loss prevention officer (store detective) To intercept shoplifters, investigate employees, and prevent losses. Loss-prevention officers provide defense against retail "shrinkage" whether it happens by shoplifting or employee theft. To provide that protection, officers check dressing rooms and other physical spaces, operate electronic surveillance equipment and stay alert for customers who act suspiciously. In some cases, officers assist with a store's opening and closing procedures. When theft occurs, officers will also interrogate, search and detain suspects, and prepare to testify against them in court.