Free Full SDK (demo program with source code , VB,VC,DELPHI) * Built-in bi-color LED(red/blue) and buzzer * support Mifare ISO14443A (Mifare_1K（S50），S70) * reading distance 0 to 10cm * OS : win XP,win2k,win vista, win7,win8(32-bit and 64 - bit),linux