- Set of 50 rewritable RFID key fobs 125 KHz, model T5577, ideal for access control systems and personnel management. - Made of waterproof ABS, resistant to water and daily use, with high-quality internal copper coil. - ATMEL T5577 chip compatible with most 125 KHz RFID systems (not compatible with NFC or mobile phones). - Allow up to 100,000 read and write cycles, ideal for creating new or backup tags. - Reading distance from 0 to 10 cm, depending on the reader and usage environment. - Each key fob includes a metal ring for easy transport and use on keychains or identification cards. - Suitable for access control systems, personnel identification, security patrols, and attendance systems. - Not factory programmed, require writing before use in locks or RFID systems.