The product is a pack of 25 writable RFID key fob proximity ID cards, specifically model T5577 or 5200. These tags are designed for use with RFID readers and writers, making them ideal for keyless access systems in various settings such as facilities, businesses, and industrial environments. The re writable feature allows for easy customization and security management. With a 125kHz frequency, these tags provide reliable access control and can be used for maintaining safety and security in specific areas.