idk why, but i can’t read this kind of badges :
ref : HID iclass 2k
site : HID® iCLASS® 205x iCLASS Key II | HID Global
datasheet : https://www3.hidglobal.com/doclib/files/resource_files/pacs-iclass-key-ii-en.pdf
do you have an idea why ?
according to datasheet it is 13.56 khz rfid badges