The Canon CR-50, CR-80, CR-135i and 190i check transports are high tech imaging machines for check scanning in a compact package. In order to create accurate images, the lenses need to be cleaned often to remove dust or ink debris that could distort or alter the image. This Canon Check Transport Cleaning Card, featuring Waffletechnology®, is specifically designed to maintain these Canon check transport models. When used as a consistent maintenance product, this card will keep your Canon CR-Series check transport performing as designed. This cleaning card is approved and endorsed by Canon to be the only product used on their equipment. Use this product once per week or after 2,000 checks scanned.