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Door access control has become a very vital part of your security structure. The door readers monitor the electric lock and determine who gets entry into the building. The access control readers conduct credentials which can be cards that fit in your wallet, or thick lanyard cards with holes that can be put around your neck, or keyfobs that integrate with your keyring. The latest door readers can also open your door with your smartphone. The most secure credentials include your biometric attribute. Your face or fingerprint provides right identification of you rather than the credential you bear. This article conveys how door access control systems functions The Door Reader for Door Access: The door readers with the help of credentials possess embedded circuits and an antenna. The reader transmits a signal that is received by the credential antenna. The transmitted electrical signal from the door reader carries enough power to energize the circuit in the credential. Once the electric c