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M1 Chip Technology: Features M1 wristband with advanced RFID technology for reliable access control and identification purposes Unique Pre-Programmed ID: All chips include a unique 4-byte UID that is pre-programmed and permanently locked to prevent unauthorized changes High Frequency Operation: Operates at 13.56MHz frequency ensuring fast and secure communication with compatible RFID readers ISO14443A Compliance: Meets ISO14443A international standards for contactless smart card technology and compatibility Adjustable Silicone Design: Black silicone wristband with adjustable sizing to fit comfortably on various wrist sizes, pack of 10 included, Manufacturer: YARONG