The function of security equipment is to prevent the entry of unauthorized persons into protected spaces, to keep out undesired objects and substances, and to sound warnings when dangers threaten a person, family or larger group Security equipment covers a wide assortment of protection, identification, surveillance and detection devices, such as cameras, alarm systems, scanners, closed-circuit televisions, x-ray machines and much more It also includes a number of more basic items, such as tags, cases, access cards, gates, locks and mirrors, as well as complete security systems for homes, businesses and other facilities.