This cleaning card design incorporates a special magnetic code to allow the acceptance of this cleaning card into a variety of different models of Bill Acceptor. The acceptance rate of this card is 98% of models used in North America; eliminate the guess work of which card to use on the bill acceptor you wish to clean. Once the cleaning card enters the bill acceptor, the Waffletechnology® design allows the cleaning card to reach the optical lenses and other critical components. Use this product once per week to maintain a high acceptance rate for currency.