Welcome to our store! Experience sensitive sensing with a 0.8-3.9 inch sensing distance (depending on the card reader) and a rapid 0.1-second sensing time. Perfect for access control, time attendance, elevators, parking lots, hotel door locks, and more. Crafted from premium PVC material, these tags are waterproof and drop-proof, ready to withstand any environment. Unlike standard IC cards, these can repeatedly erase and write IC card numbers and sectors, with sector 0 and other sectors fully open. Compact and lightweight, these tags are easy to store and carry. This set of 50 tags fully meets your needs. Item Type: IC-CUID Key Fob Material: PVC Induction Distance: Approx. 2-10 cm/0.8-3.9 in (depending on the card reader) Working Frequency: 13.56MHZ Working Temperature: -40-55 Application: Ideal for 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: These key fobs differ from ordinary IC cards; they can repeatedly erase and write IC card numbers and sectors, with sector 0 and other sectors fully open. If standard IC cards read and write successfully but cannot open the door, or there is no response when swiping the card, then you can use this CUID card. Includes: 50 x Key Fobs