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[Music] there are two main types of credentials that are commonly used in access control systems 125 kilohertz proximity and smart cards but what is the difference between them and how does each one work prior to 1975 all card identification systems relied on magnetic stripe cards however as these required physical contact between the cards and the reader to work eventually one or the other would wear out and need to be replaced in 1975 radio frequency identification rfid was invented this technology allowed a string of binary code to be transmitted over radio waves so that the card no longer had to make physical contact with the reader in order to be verified this meant that both cards and readers would last much longer before wearing out the technology was known as 125 kilohertz proximity the 125 kilohertz refers to the radio frequency at which the signal is transmitted from the card to the reader each proximity card is pre-loaded with a string of binary code that is unique to the c