POS Hardware Checklist: Scanners, Receipt Printers, Cash Drawers, and Card Readers

A working retail counter needs four pieces of hardware: a barcode scanner to ring up items fast, a receipt printer for a paper or emailed receipt, a cash drawer to hold and secure cash, and a card reader that accepts tap, chip, and swipe. Everything past that — a second scanner for receiving, a label printer, a customer-facing display — is an upgrade, not a requirement. Buy in that order, connect the printer and drawer before the scanner and reader, and run one full test sale before you open the doors.

What Hardware Do You Actually Need to Ring Up a Sale?

POS hardware is the physical equipment that turns a tablet, laptop, or terminal running point-of-sale software into a working checkout counter — a scanner to read items, a printer to produce a receipt, a drawer to hold cash, and a reader to take a card.

• Barcode scanner — reads UPCs so a cashier doesn't type prices by hand
• Receipt printer — prints the sale, and usually triggers the cash drawer to open
• Cash drawer — a locking box that holds the float and change
• Card reader — accepts tap, chip insert, and swipe
• Optional: a barcode label printer for pricing your own stock
• Optional: a second, smaller scanner in the stockroom for receiving

What Does Each Piece of Hardware Actually Do?

It helps to know what each device is actually for before you shop, because the specs that matter differ for each one.

• Barcode scanner — reads a GS1 UPC or EAN barcode and passes the number to your POS, which looks up the item. Faster and more accurate than typing a SKU, and it prevents a cashier from keying in the wrong price.
• Receipt printer — prints a paper receipt after the sale, and in most setups also carries the signal that pops the cash drawer open. Many stores let customers choose paper or email instead.
• Cash drawer — a lockable box for bills and coins. It usually opens automatically when a cash sale completes (via a cable run through the receipt printer), and has a key or lever for manual opens.
• Card reader — accepts tap, chip insert, and swipe, and talks to your payment processor to authorize and capture the charge. This is the device that actually moves the money.

How Do These Devices Connect to a POS System?

Most POS hardware connects one of three ways: USB (wired, most reliable, no batteries to die mid-shift), Bluetooth (wireless, common for scanners and mobile card readers), or a network/Wi-Fi connection (some receipt printers). The cash drawer is the odd one out — it's rarely a standalone connection. It's almost always wired to the receipt printer through a short cable, and the printer sends the "open" signal on a cash sale.

• USB — plug-and-play for most scanners and printers; use a powered hub if you're connecting more than two devices to one tablet or laptop
• Bluetooth — good for a scanner you want to carry around the floor, or a card reader that needs to sit closer to the customer
• Printer-to-drawer cable — the standard way a cash drawer opens automatically; check that your printer and drawer use the same connector before buying either one separately

What Should You Buy First on a Tight Budget?

If you're opening lean, buy in this order: the card reader first, because you can't take a payment without one. Then the receipt printer and cash drawer, usually sold as a bundle. Add the barcode scanner once you have real volume — a small shop can survive its first weeks on manual item lookup, but it slows every line down. A label printer for pricing your own stock is the last thing to add, and only if you're printing your own barcodes rather than using vendor UPCs.

What's the Right Setup Order to Avoid a Day of Troubleshooting?

Most opening-day hardware problems come from connecting devices in a random order and testing nothing until a customer is standing at the counter. Do it in this order instead:

• 1. Set up the POS software first — log in, build or import your catalog, and confirm your tax and tender settings before any hardware arrives.
• 2. Connect the receipt printer and print a test receipt from the settings menu.
• 3. Connect the cash drawer to the printer and confirm it opens on a manual "no sale" before you trust it on a real transaction.
• 4. Connect the barcode scanner and scan one item into the catalog search field to confirm it's reading correctly.
• 5. Connect the card reader and run a small test charge, then refund it.
• 6. Run one complete sale end to end: scan the item, take payment, print the receipt, confirm the drawer opens.
• 7. Only then open for the day.

Do You Still Need a Cash Drawer If You're Mostly Cashless?

Most stores still take some cash, even ones that are overwhelmingly card-based — a customer paying with a gift certificate, a return that needs change, a regular who just prefers bills. A drawer also gives you a place to keep an opening float and count against it at close, which matters for cash handling procedures and for spotting shortages before they become a pattern. If you pass card processing fees on to customers, check how your POS handles surcharges vs. cash discounts — it changes what you post at the register, not what hardware you buy.

How Does Retailer OS Handle POS Hardware?

Retailer OS pairs with barcode scanners, receipt printers, and Stripe Terminal card readers for tap, insert, and swipe. Card payments run on the merchant's own Stripe account — you bring your own keys — so in-store and online charges reconcile on one surface instead of two separate processor dashboards. An optional per-sale card-fee passthrough is available if you choose to pass processing fees to customers.

Cash management is built around the drawer you already own: open with a float, and at close, Retailer OS shows what the drawer should hold, lets the cashier enter counted cash, and records the difference with a note — the count isn't blind. That flow is covered in detail in how to close out a cash register.

One hardware-adjacent detail worth planning around: offline selling is available in the desktop app only. If your internet drops, the desktop app keeps ringing sales and syncs everything once you're back online — nothing lost. The iOS app doesn't have an offline mode, so if you're running checkout on an iPad and connectivity is unreliable, that's a real factor in which device you put at the counter.

For the full picture of what runs alongside the hardware — inventory, staff, and reporting on the same catalog — see what a modern POS should do for an independent store and the retail operations management overview. If you're still pricing out a full setup, how much a retail POS system really costs breaks down software, hardware, and fees together.