Industry standard 125KHz RFID technology26 bit Wiegand formatNon-contact reading for long lifeUse with the Viking PRX-1, PRX-2, PRX-3, PRX-5 or certain legacy 125KHz HID proximity card readersPRX-C is a durable 0.070 thick plastic card with a slot for neck strapPRX-C-ISO is a thin 0.032 thick flexible ISO style cardPRX-FOB is a durable key ring fob with a IP67 rating allowing it to even withstand the washing machineUp to 253 facility codes and 65,534 card numbers availableCannot be erased by a magnet
