MF RC522:   
is used in highly integrated 13.56 MHz contactless communication card chips to read and write,    

The MF RC522 uses an advanced modulation and demodulation concept completely integrated into all    

communication methods and protocols at 13.56 MHz.    

The MFRC522 transmission modules support the following operating modes:
Reader/writer mode supporting ISO 14443A/MIFARE
The RFID module with the Philips MF RC522 chip is used for RFID product development.
The module supply voltage is 3.3 V; users can connect the module to any CPU board with the SPI interface.    

IC Card:    

Capacity: 8 KB EEPROM;
Divided into 16 sectors, each sector has 4 blocks, each block is 16 bytes, each block is 1 unit;
Each sector has a separate set of passwords and access control;
Each card has a unique 32-bit serial number;
Has an anti-collision mechanism, supporting multi-card operations;
No power, with an antenna, embedded encryption control logic, and communication logic circuit;
Data retention period of 10 years, can be rewritten 100,000 times, reading is limitless;
Operating temperature: -20°C ~ 50°C; Humidity is 90%;
Operating frequency is 13.56 MHz;
RF protocol: ISO14443A;
Communication speed: 106 KBPS;
Read and write distance: ≤ 10 cm (regardless of reader);    

NFC TAG Keychain:    

Main Chip: Philips Mifare 1 S50;
Storage capacity: 8 Kbit, 16 partitions, each partition with 2 group passwords;
Operating Frequency: 13.56 MHz;
Communication speed: 106 Kbaud;
Read and write distance: 2.5 ~ 10 cm;
Read and write time: 1 ~ 2 ms;
Operating Temperature: -20°C ~ 85°C;
Endurance: > 100,000 times;