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Unique ID Pre-Programmed: All the Chip has Unique ID pre-programed, 4 byte UID, And UID Can't change M1 Chip Technology: Features M1 S50 chip compatible with ISO14443A standard for reliable RFID performance Operating Frequency: Works at 13.56MHz frequency for NFC and RFID access control applications Durable Waterproof Construction: Made from ABS material that provides waterproof protection for long-lasting use Convenient Key Fob Design: Includes metal ring attachment for easy carrying on keychains and lanyards, pack of 100 white key fobs