PIN PAD

http://en.wikipedia.org/wiki/PINpad

A PINpad is an electronic device used in a debit or smart card-based transaction to input and encrypt the cardholder's PIN. PINpads are normally used with integrated point of sale devices in which the Electronic Cash Register (ECR) machine is responsible for taking the sale amount and initiating/handling the transaction. The PINpad is required so that the customer card can be accessed (in the case of chip cards) and the PIN can be securely entered and encrypted before it is sent upstream to the transaction manager of the switch or the bank. In some cases, with chip cards, the PIN is only transferred from the PINpad to the chip (within the PINpad itself) and it is verified by the chip card.