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

The MF RC522 use of advanced modulation and demodulation concept completely integrated in all    

communication methods and protocols at 13.56MHz.    

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

IC Card:    

Capacity: 8KB EEPROM;
Divided into 16 sectors, each sector is 4 blocks, each block is 16 bytes, each block as 1 unit;
Each sector has a separate set of passwords and access control;
Each card has a unique 32-bit serial number;
Have anti-collision mechanism, support for 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 limitless;
Operating Temperature -20 centigrade ~ 50 centigrade ; Humidity is 90% ;
Operating frequency is 13.56MHz;
RF protocol : ISO14443A;
Communication speed : 106KBPS;
Read and write distance : ≤ 10cm (regardless of reader);    

NFC TAG Keychain:    

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