The proximity card reader has several advantages over other input devices. Like traditional magnetic stripe cards, proximity cards cannot be easily shared by employees - a card cannot be in two places at once.
Unlike magnetic cards, however, you never have to struggle with failed swipes. You simply hold your card within a few inches of the environmentally sealed reader to gain access to the site. This is especially handy in colder climates, where you don't have to remove gloves to swipe a card or enter a keycode.