Parameter Size: L153mm X W87mm X H21mm Color: gold, silver grey, black, and blue Power supply: DC12V, power consumption less than 2W Working frequency: 125 KHz (support EM card) Effective distance: 40 100mm (depending on card quality) Working environment: -20°C to 55°C ; Relative humidity 5% to 95% Communication output: Standard Wiegand (RS485/RS232 optional) LCD display, blue backlight, 4 lines text, support reading card and keypad operation RS485 and RS232 communication with SDK support to customer Industrial design, aluminum alloy case, suitable the top grade office or intelligent buildings