Use this product to clean smart card readers of all types. The Card Reader Cleaning Cards are designed using Waffletechnology® to clean the magnetic stripe readers (MSR) and read pins located inside all smart card or EMV (chip and pin) card readers. These sensitive pins allow communication between the credit card and the card reader; keeping these card reader contact pins clean is essential to the POS (Point of Sale) card readers ability to read information from the card. Use this product once per week to help avoid credit card misreads.