Click on the following link for product video demo presentation. https://youtu.be/zdls2TGg1RM

Features
useful links: 
1: http://www.electroingenio.com/arduino-en/arduino-and-rfid/
2: http://blog.roman-mueller.ch/index.php/2013/03/27/problem-with-mf522-serial-13-56mhz-rfid-readerwriter/
3: https://www.youtube.com/watch?v=htC1bNWYvAs
4: https://www.youtube.com/watch?v=pYyAxe_gi9I
5: https://www.puntoflotante.net/KIT-RFID-UART-13.56-MHZ-RC522-ISO-14443A-TAGS.htm

Highly integrated analog circuitry to demodulate and decode responses
Supports ISO/IEC14443A/MIFARE
Typical operating distance in Reader/Writer mode for communication to a ISO/IEC14443A / MIFARE is 40~50 mm
Supports MIFARE Classic encryption in Reader/Writer mode
Supports ISO/IEC14443A higher transfer speed communication up to 848kbit/s
Control by Serial UART interface: Baud rate could be 2400bps ~ 115200bps, with default baud rate 9600bps
With the chip ISO14443, it supports MIFARE standard encryption algorithm
Configuration data is preserved in EEPROM against power cut off
Built-in 8K EEPROM, easy to access it by sending commands
Easy to use, by sending simple commands users can control it to read or write cards
In compact command, command is as short as one byte
Excellent EMC performance
Parameter


Power Supply: 4.5V~5.5V, typically 5V.
Interface: UART (5V TTL) and SPI (3.3V TTL)
Size: 40mm x 50mm
Usage


Baud rate could be 2400bps ~ 115200bps

This RFID module is desgined based on MFRC522. It is a highly integrated reader/writer for contactless communication at 13.56MHz. It supports ISO 14443A/MIFARE mode and MIFARE Classic (e.g. MIFARE Standard) products. Contactless communication using MIFARE higher transfer speeds up to 848kbit/s in both directions.
We embeded an MCU on this module. By sending command via UART interface, you can make it work. Operation is very easy. Most work is done by the embeded MCU. There is also a SPI interface on the board. This is the MFRC's SPI. You can access MFRC directly via this inteface.

Features:

1. Highly integrated analog circuitry to demodulate and decode responses
2. Supports ISO/IEC14443A/MIFARE
3. Typical operating distance in Reader/Writer mode for communication to a ISO/IEC14443A / MIFARE is 40~50 mm
4. Supports MIFARE Classic encryption in Reader/Writer mode
5. Supports ISO/IEC14443A higher transfer speed communication up to 848kbit/s
6. Control by Serial UART interface: Baud rate could be 2400bps ~ 115200bps, with default baud rate 9600bps
7. With the chip ISO14443, it supports MIFARE standard encryption algorithm
8. Configuration data is preserved in EEPROM against power cut off
9. Built-in 8K EEPROM, easy to access it by sending commands
10. Easy to use, by sending simple commands users can control it to read or write cards
11. In compact command, command is as short as one byte
12. Excellent EMC performance

Specifications:

1. Power Supply: 4.5V~5.5V, typically 5V.
2. Interface: UART (5V TTL) and SPI (3.3V TTL)
3. Size: 40mm x 50mm
4. Baud rate could be 2400bps ~ 115200bps

Default setting:

1. Baud Rate: 9600bps
2. Parity bit: None
3. Start bit: 1
4. Data bit: 8
5. Stop bit: 1

Product list:

1. RFID module x1
2. MIFARE1 S50 suqare white card x1
3. MIFARE1 S50 key card x1
4. FM110 suqare white card (compatible with MF1 S50)
5. 4-pin wire x1