Magnetic Swipe Readers (MSRs) and Writers
Magnetic Stripe Readers (MSR) are the devices through which credit or debit cards are swiped and read.
These are by far the most common device in all segments of the retail and service world today. If you take credit cards, you have some form of MSR.
If you don’t have a POS system, you may have a receipt printer that has a built-in MSR