Do you have an NFC device that is hard to read? Could be a Card Reader, NFC Lock, or even your own cell phone? This passive device will shape the NFC field and repeat the signal that it produces so the reader can function from further distances. Simply place the Repeater between the NFC Reading Device and the card, and the signal will be amplified so that it can be read from further distances. This repeater will work on any NFC device that operates at 13.56Mhz. Has a 3m Adhesive backing. It does not require power and doesn't itself emit any field. It takes the existing field and retunes it so it can achieve a better range.