Proximity ID cards use different technology to transfer data than magnetic stripe or barcode. When proximity card is presented against the reader (usually within 3 inches) data stored on a built-in chip is being transmitted using radio frequency. How ID card, thin as credit card can generate radio waves? The technology is called resonant energy transfer; when ID card is placed in the magnetic field of the reader a built in coil generates electric power to read the chip, then the same coil is being used as RF antenna to transmit the data to the reader. Older cards use 125kHz range while newer, often referred as radio frequency id cards (RFID) or contactless smartcards use 13.56MHz. Higher frequency allows for more bandwidth in data transfer. Proximity card overcomes all the issues that magnetic stripe and barcode ID cards suffered from; it allows for contactless read and doesn’t need to be placed against the reader under certain angle like barcode card in order to be read. Convenience in use is further improved by the ability to read the card in the wallet, pocket, pouch or even a purse. HID is the industry leader in manufacturing proximity cards, reading equipment and integration services.