Catalog > Internet of Things (IOT) Related Products > More Platforms EM4100 125KHz RFID Card EM4100 125KHz RFID Card HKD RFID CARD 125KHZ (5PKT) EM4100 125KHz RFID Card 31.73 ZAR inc for 1 Each 87 in Stock Add Specifications, Prices & Availability may change without notice. Images are for illustration purposes only. E&OE Overview 125KHz RFID Card EM4100Protocol Read-only. Compatible with 125Khz EM4100 RFID Card Read Module RDM630 UART Output Arduino shield.