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There are two main types of credentials used in access control systems: 125 kilohertz proximity cards and smart cards. Before 1975, identification systems relied on magnetic stripe cards, which required physical contact with the reader, leading to wear and tear. The invention of radio frequency identification (RFID) in 1975 allowed for a string of binary code to be transmitted over radio waves, eliminating the need for physical contact. This technology, known as 125 kilohertz proximity, allows cards and readers to last longer. Each proximity card has a unique pre-loaded binary code that is transmitted to the reader during access verification.