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The popular MIFARE Classic 1K chip from NXP operates at 13.56 MHz wireless frequency, according to the ISO 14443A standard, and contains 1K bytes of read/write memory that can be used for multiple applications.
MIFARE Classic Chips typically operate at a distance of up to 10cm depending on the power provided by the reader.
These are specifically green Keychain Tags- great for access control. They have their UID printed on each tag for recording purposes