Features: The CUID features rewritable programming (100,000 cycles) and 13.56MHz ISO14443A compliance, enabling smooth cloning of /IC cards with standard writers like Proxmark3 or iCopy devices. This 25mm round small sticker combines a S50 chip with ASK encoding for stable data transmission, backed by industrial adhesive for permanent attachment on metal surfaces and equipment. Ideal for IT administrators, security professionals, and small home enthusiasts requiring reliable solution for access control device , asset trackings , or device authentication. Perfect for cloning employee badges in corporate environment, duplicating hotel keycards during travel, or managing warehouse inventory through allowed os system devices. Engineered with batches variable coils designs (typically circular) and defaults passwords 12F compatibility, this CUID electronic tokens ensures crossing device functionality with readers while maintaining ISO14443 protocol standards. Specifications: Material: metal Diamter: about 25mm/1in Article number: CUID Induction distance: 3cm Chip: Read and write card Storage capacity: 1 (bit) Reading and writing time: 1 (MS) Package Includes: 5/10/20/50xCUID Electronic note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.