High frequency (HF) cards are currently the only type of card supported by existing gate systems. HF cards have a shorter read range (1 meter maximum) and require more power. They are also the most widely used, accepted, rapidly growing and secure technology in the world.

Ultra high frequency (UHF) cards are supported by and more appropriate for handheld RFID scanning solutions. Their read range is longer (two to three meters), they require lower power so battery powered devices can last much longer and the read rate is fast making them appropriate for the handheld environment.