This part is the replacement credit card reader for the optional magnetic card reader built in to the right hand side of the following models
Please keep in mind that this part is only a reader of credit cards and cashier/server cards. It does not do the processing. In order to do that your cash register musty be equipped with a Datacap Tran Device that does the processing. The only thing this reader can do on it's own is reader server/cashier cards.
As with any part you should unplug your register before removing and replacing parts. We always recommend backing the register up too before making repairs.