ACR300 Bus Validator EMAIL is Sznancy6( at) gmail.com MSN is Nancy0806( at) live.cn SKYPE is toner860301 32-bit Arm-9 / Linux 64MB flash and 64MB SDRAM and 2GB SD card Contactless Interface Reader supporting ISO14443 A & B and Mifare Cards USB Full Speed Host RS232 Interface 2 x ISO7816 SAM-Size Card Slots Card Authenticity, Validity & Blacklist check Graphical LCD with Backlight Driver red/ orange/ green LED indicators 2 control buttons Speaker and Buzzer Real time clock Dust and water resistant Over Voltage & Over Current Protection Support USB secured thumb-drive data extraction Firmware Upgradable ( Optional) GPS