- Thin 0.032 thick flexible ISO style card- Industry standard 125KHz RFID technology- 26 bit Wiegand format- Non-contact reading for long life- Use with the Viking PRX-1, 2, 3, 5 and certain legacy 125KHz HID proximity card readers- Up to 253 facility codes and 65,534 card numbers available- Cannot be erased by a magnet