This bill validator cleaning card encoded on both ends of the card, works in all bill validators and readers regardless of manufacturer or model. These cards provide a one-step, on-the-spot solution to nearly all maintenance problems. This cleaning card has a special magnetic code to allow the acceptance of this cleaning card into a variety of different models of Bill Acceptors. Eliminate any doubt on which card to use. Once the cleaning card enters the bill acceptor, the encoded ends allows the cleaning card to be accepted and clean the optical lenses and other critical components. Use this product once per week to maintain your bill acceptor.