Brand new and high qualityFree Full SDK (demo program with source code ， VB，VC，DELPHI)support Mifare ISO14443A (Mifare_1K（S50），S70) Operation frequency : 13.56MhzBuilt-in transceiver antennareading distance 0 to 10cmLess than 35ms decoding timeUSB 2.0 / USB 1.1 interfaceevoltage：DC 5 Vworking current：＜60mABuilt-in bi-color LED(red/blue) and buzzer size : (95 ×70× 18)mmOS : win XP，win2k，win vista， win7，win8(32-bit and 64 - bit)，linux Please download software from the following linksER301_SDK_EN.rar Package included:1 x RFID 13.56Mhz Mifare ISO14443A Reader & Writer USB Interface1 x S50 CARD1 x S50 BLUE KEY TAG1 x S50 STICK TAG