Technical specifications:
·Frequency：125KHz 
·Operating range：0 °C to +40 °C 
·Storage range：-10 °C to +85 °C 
·Humidity range：10% to 95% non condensing 
·Host interface：Serial RS232 or PS/2 (RD900ID)
·RS485 or serial RS232 (RD800ID) 
·Power supply voltage  DC5V ± 5% (RD900ID)
·DC12V (RD800ID with RS485) 
·BPS：1200-9600bps 
·Support cards：EM card 
·Operating distance：up to 10cm, typical 5cm 
·Operating system: Windows 98/me/2000/NT/XP