A proximity card is a generic name for a contactless integrated circuit device. A proximity card is used for security access or payment systems. Proximity cards are powered by resonant energy transfer via an LC circuit, and typically have a range of 0-3 inches. The price of these cards is typically low, usually between $3–$8 per card, making them a cost-effective option for identification cards, keycards, payment cards, and more. Proximity card technology offers a way to restrict access to certain parts of a building and monitor who attempts to gain entry to these areas.