This is a 13.56MHz Key Ring RFID Tag that built in the MIFARE MF1 S50 chip with 1K EEPROM.
Features:
Contactless transmission of data and supply energy
Operating Frequency: 13.56MHz
Chip: Mifare S50
Memory: 1K EEPROM
Protocol: ISO1443A
Waterproof
Applications: Access Control, Personal Identification, Logistic automation etc