Catalog > Internet of Things (IOT) Related Products > More Platforms EM4100 125KHz RFID Card EM4100 / 125KHz RFID Card EM4100 125KHz RFID Card Part No: HKD RFID CARD 125KHZ (5PKT) 32.00 ZAR inc for 1 Each (Quoting) Add to Cart 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.