Waffletechnology Smart Cleaning Card, Bag of ten (KW3-EMVP10) Waffletechnology cleaning cards dramatically outperform flat cleaning cards and allows anyone to easily and safely maintain devices without opening the equipment or damaging critical sensors This product features patented evanish solution that effectively breaks down dirt and debris in the card parts and on the read head for effective cleaning; safe to use on Electronic components. Sensitive chip readers should be cleaned to avert misreads, reduce manual data entry and fraud potential. Cleaning must be done at least once per week. Clean more frequently after periods of High usage and outdoor usage. Clean when experiencing card rejection, reader error or repeated swipes