125Khz RFID module RDM6300
Features
- Support external antenna
 - Maximum effective distance up to 50mm
 - Less than 100ms decoding time
 - Uart interface
 - Support EM4100 compatible read only or read/write tags
 - Small outline design
 
 
Link penting :
documentation klik!  http://wiki.iteadstudio.com/RDM6300
Arduino tutorial via instructable  : http://www.instructables.com/id/Arduino-Tutorials-RFID/