Features 1Sensitive sensing, 0.83.9in sensing distance (depending on the card reader), 0.1 second sensing time. 2Suitable for access control, time attendance, elevators, parking lots, hotel door locks, etc. 3Made of premium PVC material, waterproof and drop resistant, can cope with all kinds of environments. 4Different from ordinary IC cards, it can repeatedly erase and write IC card number and sectors, 0 sectors and other sectors are fully open. 5Compact size, light weight, easy to store and carry around for you. Total of 50pcs tag, fully meet your needs. Specification Item Type: IC-CUID Key Tag Material: PVC Induction Distance: Approx. 2-10cm/0.8-3.9in (depending on the card reader) Working Frequency: 13.56MHZ Working Temperature: -40-55 Application: Applicable to access control, hotel door locks, employee attendance, campus access control payment control, identification and security systems, parking lot access control payment, social security management, transportation payment, municipal and auxiliary service payment, etc. Instruction: This key tag is different from ordinary IC cards, it can repeatedly erase and write IC card number and sectors, 0 sectors and other sectors are fully open. Use ordinary IC card to read and write successfully but cannot open the door, and there is no response when swiping the card, then you can use this CUID card Package List 50 x Key Tag