Features 1Application: Writable keyfob is used in a wide range of applications, including access control system, elevator, time and attendance system, parking lot, apartment card and so on. 2Convenience: The rewritable key fob requires no physical touch simply bring it close to the card reader for seamless operations, enhancing user experience and efficiency. 3Security: Featuring advanced encryption technology, the writable key fob ensures that your sensitive information is securely stored and protected from unauthorized access and theft. 4Durability: 13.56MHz Key fob is made of plastic, water resistant, drop proof, high temperature resistant, wear resistant, suitable for various environments. 520pcs Kit: With this purchase, you receive 20 writable key fobs, ensuring that you have plenty of replacements for family, friends, or organizational use. Specifications Item Type: 13.56MHz Key Fob Material: Plastic Working Frequency: 13.56MHz Application: Access Control System: Used to control access rights in companies, schools and other places. Attendance Management: Used for employee attendance clocking, improve efficiency and accuracy of attendance. Public Transportation: Such as bus cards, subway cards, etc., convenient and fast payment methods. Logistics Management: Tracking the flow of goods, improve the efficiency of logistics management. Weight: Approx. 91.00g or 3.21oz Package List 20 x 13.56MHz Key Fob