S50 RFID NFC Transparent Keychain Tag 13.56MHz MIFARE Classic 1K Waterproof

The S50-Keychain is a transparent RFID NFC keychain tag built around the NXP MIFARE Classic 1K (S50) chip, designed for contactless identification and access control in everyday environments. The tag operates at a 13.56MHz high-frequency band under the ISO14443A protocol, making it compatible with the vast majority of 13.56MHz RFID and NFC readers used in electronic locks, attendance terminals, and payment systems. Its embedded 1KB EEPROM provides 16 sectors with independent keys and access conditions, supporting secure read and write operations for identification data, membership records, and stored value applications. The chip carries a permanent 4-byte unique identifier (UID) burned at manufacture, allowing each key fob to be distinguished individually without any programming. The transparent epoxy body is fully waterproof, wear-resistant, shockproof, and drop-resistant, and the compact keychain form factor attaches easily to a keyring, lanyard, or bag. This 13.56MHz NFC tag is suited to door access systems, employee attendance tracking, public transportation tokens, parking management, membership cards, and event ticketing, and it pairs readily with PN532-based readers and Arduino NFC/RFID shields for development work.