Contactless card the chip of low frequency 125KHz, high frequency 13.56MHz, or ultra-high frequency 860~960MHz Low FrequencyCard ICsFrequencyMemory sizeSupplierRF StandardInfoEM4100,EM4102125KHz64 bit R/OEM/DetailsEM4450,EM4550125KHz1K bit R/WEM/DetailsATA5557,ATA5567125KHz330 bit R/WATMEL/DetailsHitag 1125KHz2K bit R/WNXP/DetailsHitag 2125KHz256 bit R/WNXP/DetailsHitag S2048125KHz2K bit R/WNXP/ ...