A POS terminal is the device a business uses at checkout to accept payments. Depending on the product, it may be a basic card machine, a handheld register, an all-in-one countertop system, a phone using Tap to Pay, or an unattended kiosk. The terminal is only one layer of a payment operation: the complete setup can also include POS software, a network, receipt and cash hardware, a payment processor, and a merchant bank.
This guide explains the terminology, transaction flow, hardware, connectivity, security, costs, setup and selection criteria you need before buying one.
POS terminal, card reader and POS system: what is the difference?
“Point of sale” means the place and moment where a customer completes a purchase. A payment terminal reads payment credentials and requests authorization. PCI Security Standards Council describes the broader payment system as the terminal plus the register, software, network, connected peripherals and processor relationship (PCI SSC).
| Term | What it does | What it may not include |
|---|---|---|
| Payment terminal | Accepts card, wallet or other electronic payments. | Inventory, employee management or a product catalog. |
| Card reader | Reads magnetic-stripe, chip or contactless credentials, usually through another device. | A screen, register, receipt printer or complete checkout software. |
| POS device | Any phone, tablet, computer, kiosk or dedicated terminal used to run a sale. | Payment acceptance unless a reader or compatible NFC software is present. |
| POS system | Checkout software combined with payment acceptance and business functions such as inventory, reports, permissions and online-order synchronization. | It may not include every peripheral a particular business needs. |
| Electronic cash register | Calculates and records sales, tax and cash activity. | Card acceptance unless connected to a payment terminal. |
| Virtual terminal | Lets an authorized user key payment details into a secure web application. | It is not a card-present terminal and can have different fees and fraud liability. |
| Gateway, processor and acquirer | A gateway transmits payment data; a processor routes and manages the transaction; an acquirer or merchant bank receives settlement for the merchant. | These roles may be combined by an integrated provider. |
Vendors sometimes call an integrated terminal a “POS terminal” even when it contains the register, customer display and payment reader. Always check the product’s actual components rather than relying on the label.
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- With Square Terminal, you can ring up sales, accept payments, and print receipts, all with one device. Use it at the counter or ring up customers anywhere in your store.
- Accept all major credit and debit cards and pay one low rate with no hidden fees and no long-term contracts.
- Process chip cards in just two seconds.
- Get your money as soon as the next business day.
- Use it cordlessly with the built-in battery, designed to last all day.
How a POS card transaction works
- The cashier scans products or selects services in the POS software.
- The software calculates the subtotal, discounts, tax, tip and final amount.
- The customer chooses cash, card, wallet, gift card or another supported method.
- The terminal reads a magnetic stripe, EMV chip, NFC contactless card or mobile wallet. Manual entry is available only where the provider permits it.
- The terminal protects the payment data and sends an authorization request through the merchant’s network and payment provider.
- The customer’s issuing bank approves or declines the request, often through a card network and the merchant’s acquirer.
- The POS records the result and displays approval or decline.
- The business provides a printed, emailed, texted or app-based receipt.
- Approved transactions are captured in a batch and settled to the merchant’s bank account according to the provider’s timetable.
Authorization is not settlement. An approval confirms that the issuer currently accepts the transaction; funds may not reach the merchant until capture and settlement occur. Timing can change with the provider, bank, weekends, holidays, risk reviews and account status.
Payment methods a modern terminal may support
- EMV chip debit and credit cards.
- NFC contactless cards.
- Apple Pay, Google Pay and Samsung Pay.
- Magnetic-stripe cards where still supported.
- PIN, signature or verification flows required by the country and provider.
- Gift cards, store credit, refunds, voids and partial refunds.
- Tips, split payments and, where enabled, QR, account-based or buy-now-pay-later payments.
- Keyed transactions, which are generally a different risk and pricing category from card-present payments.
Availability depends on country, currency, processor, merchant account, software plan, terminal model and card-network rules. For example, Square lists magnetic stripe, EMV, NFC and major mobile wallets for its U.S. Terminal (Square specifications), but that does not establish availability in every market.
Main types of POS terminals
Standalone payment terminal
A dedicated card machine operates separately from an existing register or ecommerce system. It is inexpensive and useful as a backup, but staff may need to enter the amount twice and reconcile two systems.
Integrated countertop terminal
This combines checkout software and payment acceptance, often with a customer-facing screen. It reduces double entry and simplifies training, but ties more of the operation to one vendor and can make a single outage affect checkout and payments together.
Mobile or handheld terminal
A battery-powered unit can take payment at a restaurant table, in a queue, at a market or during delivery. Mobility introduces battery, Wi-Fi or cellular coverage, durability and device-management requirements.
Mobile card reader
A small reader pairs with a phone or tablet. It suits pop-ups and low-volume sellers that already own compatible devices, although the business depends on the phone, app, Bluetooth connection and battery.
Rank #2
- A complete countertop point of sale — Combine dual responsive touchscreens, built-in POS software, and durable hardware for a fast, reliable checkout experience.
- Serve customers faster — Run smoothly through busy shifts, complex menus, and big orders with high-speed processing, memory, and responsive touchscreen displays.
- Accept every way they pay — Take all major cards at one simple rate, with no hidden fees or long-term contracts. Receive funds as soon as the next business day.
- Handle real-world demands — Resist everyday spills, dust, and wear with a durable, IP54-rated design.
- Stay reliable through every rush — Maintain strong connectivity and consistent performance through your busiest hours.
Tap to Pay on a phone
Compatible iPhones and Android phones can accept contactless cards and wallets without a separate reader. Square describes this option on its U.S. POS pricing page (Square POS pricing). It is commonly contactless-only, requires a supported operating system and device, and does not automatically provide chip insert, swipe, a printer or a dedicated employee workflow.
Unattended terminal or kiosk
Vending, parking, ticketing and self-service installations need tamper resistance, accessibility, remote monitoring, weather or vandalism protection and a recovery plan for device failure. A consumer countertop terminal is not a substitute.
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A business should buy only the peripherals its workflow requires:
- Touchscreen, tablet or computer and a customer-facing display.
- Integrated or separate payment reader.
- Barcode scanner, scale and label printer for product businesses.
- Receipt printer and cash drawer.
- Kitchen printer or kitchen display for restaurants.
- Stand, mounting bracket, Ethernet adapter, USB hub or charging dock.
- Wi-Fi or cellular equipment and, for critical counters, a backup battery or UPS.
Shopify’s hardware documentation lists readers, stands, scanners, drawers, receipt printers and barcode printers as mix-and-match components (Shopify Help Center). A service business may need only a phone and reader; a grocery store may need scanners, scales, printers and drawers.
Connectivity and offline operation
| Connection | Strength | Risk or limitation |
|---|---|---|
| Ethernet | Predictable for a fixed counter. | Requires cabling and a nearby network port. |
| Wi-Fi | Flexible and easy to deploy. | Coverage, congestion, roaming and router failures can interrupt service. |
| Cellular | Useful for mobile selling or backup connectivity. | Signal, data-plan and battery dependence. |
| Bluetooth | Convenient for a phone paired with a reader. | Pairing, range and reader-battery problems. |
| USB or local network | Connects printers, scanners and drawers. | Hubs, drivers and compatibility can cause failures. |
Cloud POS software often needs internet for account access, updates and synchronization. Offline mode is provider-specific, not a guarantee that the business can operate normally. Square says its offline payments are processed after reconnection and may be declined if the device is not reconnected within 24 hours of the first offline payment; the merchant remains responsible for expired, declined or disputed transactions (Square Terminal specifications).
Security, PCI DSS and tamper prevention
PCI DSS is shared responsibility
PCI DSS is the baseline security standard for entities that store, process or transmit payment-account data. The PCI Security Standards Council’s current document library lists PCI DSS v4.0.1, published in June 2024 (PCI document library; PCI DSS overview).
Rank #3
- Windows 11 PROFESSIONAL POS TERMINAL - Equipped with Intel Core i5 High-Performance CPU, 4 GB Memory, and 128 GB Hard Disk. It also offers versatile connectivity options, including two serial ports, four USB ports, an HDMI output, an audio input, a DC 12V power input, and an Ethernet port.
- SLEEK & COMPACT DESIGN - Volcora POS Terminal is designed to take up as little space as possible so you can focus on better utilization of the counter space. Our sleek yet heavy-duty metal base ensures the terminal is well-stabled while taking orders with style. Suitable for any business such as retail stores, quick service restaurants, dine-in restaurants, cafes, bars, and more.
- DUAL WIDE TOUCHSCREEN - Terminal comes with one 15.6" capacitive LCD touchscreen and one 11.6” capacitive LCD touchscreen for customer display, combined with 1366x768 high-resolution, makes it easy to read and touch with minimal effort. Our POS Terminals can also withstand over 15000 hours of screen time with little to no quality sacrifice.
- IN THE BOX - Volcora 15.6" & 11.6” Dual-TouchScreen Windows 11 Professional POS Terminal, Power Adapter, Registration Card, and User Manual.
- LIFETIME WARRANTY & SUPPORT - Simply unbox, and set up your POS terminal like a Windows tablet with ease. We do understand that additional support might be needed for non-tech-savvy users and our US Based Customer Service team is committed to help. Plus, all Volcora products come with a limited lifetime warranty so you can purchase with peace of mind.
Buying a product described as “PCI compliant” does not make the merchant fully compliant. PCI SSC says payment terminals remain part of the applicable cardholder-data environment, with controls determined by the terminal and surrounding systems (PCI SSC FAQ 1300).
Understand the security terms
- PCI PTS: requirements for PIN-entry and point-of-interaction devices.
- Point-to-point encryption (P2PE): protects card data from the interaction point through a validated solution.
- Tokenization: substitutes a token for sensitive card data used later.
- EMV: authenticates chip-card transactions but does not replace PCI DSS.
- TLS: protects network communications; it is not the same as end-to-end payment encryption.
PCI maintains listings for approved devices, validated software, P2PE solutions and mobile-payment solutions (PCI secure technology).
Inspect for tampering
- Compare the device with the approved appearance and check its serial number.
- Look for overlays, loose parts, mismatched seals, unexpected cables or altered PIN pads.
- Keep an inventory showing each device’s location and assigned users.
- Inspect deployed devices periodically and train staff to report replacement attempts.
- Restrict administrator access, change default credentials and apply supported updates.
- Do not allow unapproved applications or accessories.
PCI SSC’s physical-security guidance focuses on device inventories, inspection for tampering or substitution and staff training; it does not universally require every terminal to be physically tethered (PCI SSC FAQ 1281).
Mobile acceptance standards
Commercial off-the-shelf phones and tablets used for payments require a properly designed solution. PCI SSC identifies CPoC for contactless acceptance, SPoC for software PIN entry with a secure PIN reader and MPoC for mobile payment solutions. PCI SSC describes a CPoC and SPoC sunset period from May 1 through October 31, 2026, while the ecosystem transitions to newer standards (PCI SSC standards). Device locks, operating-system updates, employee separation and mobile-device management still matter.
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How much does a POS terminal cost?
The purchase price is only one part of the cost of accepting payments.
| Cost category | Examples |
|---|---|
| Hardware | Terminal or reader, phone/tablet, stand, printer, scanner, drawer, display, installation and replacement. |
| Software | Monthly POS plan, per-location or per-register charges, inventory, employee, loyalty, ecommerce and kitchen modules. |
| Processing | Percentage, per-transaction charge, keyed or online rates, card-type differences, chargebacks and instant-payout fees. |
| Contract exposure | Financing, equipment leases, minimums, cancellation terms and support or onboarding charges. |
Examples illustrate vendor pricing, not a universal market rate. Shopify’s U.S. guide updated June 21, 2026 lists a $349 POS terminal, $49 card reader, $149 tablet stand, receipt printers from $289, barcode scanners from $209 and a $139 cash drawer (Shopify POS hardware guide). Square lists its U.S. Terminal at $299 or $27 per month for 12 months, with card-present processing shown as 2.6% + 15¢ per tap, dip or swipe and no monthly fee or long-term commitment for that listed offer (Square Terminal specifications). Prices, taxes, eligibility, financing approval, geography and terms can change.
Rank #4
Compare hardware + software + processing + add-ons + installation + support + replacement cost + contract exposure. A $49 reader may require a separate phone, stand, printer and subscription; a $349 integrated terminal may replace several of those components.
Provider-neutral setup checklist
- Choose the POS software and payment provider.
- Confirm business identity, tax registration and bank-account requirements.
- Verify country, currency, card networks, payment methods and supported hardware.
- Purchase only compatible devices and accessories.
- Connect power and the network, then install updates.
- Pair the terminal with the register or tablet.
- Configure products, prices, taxes, discounts, tips, receipts and user permissions.
- Connect scanners, printers, drawers and displays.
- Run a test sale, refund, void, cash transaction, tip and tax scenario.
- Test a network failure and any available offline mode.
- Reconcile the test authorization, capture and settlement.
- Train staff on normal operation, duplicate-payment prevention and suspicious-device reporting.
- Record serial numbers, locations, assigned users and support contacts.
- Write backup procedures for internet, power and hardware failures.
A device that powers on is not necessarily an operational POS. Catalog accuracy, tax settings, permissions, settlement reconciliation and recovery testing are equally important.
Common failures and safe recovery
Terminal will not connect
Check power, battery, Wi-Fi or Ethernet, Bluetooth pairing, the POS app, router or firewall, provider status, register assignment and pending updates. Use an approved backup network or terminal rather than moving card data into an unapproved channel.
Payment declined
Possible causes include an issuer decision, insufficient funds, wrong PIN, unsupported card, fraud controls or terminal configuration. Do not invent a reason beyond the message the terminal provides.
Chip or contactless fails
Follow the provider’s prompts: try insert instead of tap, remove the card from a wallet or case, use another approved terminal or restart only as instructed. Do not default to swipe or manual entry, which can change fraud liability and pricing.
Possible duplicate transaction
A timeout can occur after authorization succeeds. Check transaction history before retrying, use the provider’s lookup or recovery function and reconcile the eventual batch.
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- With Square Handheld, you can accept payments, take tableside orders, or scan barcodes anywhere. With a slim design and comfortable grip, the POS is easy to carry in your palm or pocket. Square Handheld is designed to withstand water splashes and dust. Add an optional protective case for accidental drops. A long-lasting battery and offline payments let you keep selling.
- Slim, pocketable, and lightweight so you can accept payments wherever your customers are.
- Take tableside orders, bust lines, or use the built-in barcode scanner, all with one sleek device.
- A battery that can power through your shift and offline payments let you keep selling, even if your internet is down.
- Accept all major credit and debit cards and pay one simple rate with no hidden fees and no long-term contracts required.
Internet outage
Use approved offline mode, cellular backup or a spare terminal if available. If safe offline processing is unavailable, pause card acceptance, record cash sales separately and reconcile delayed transactions after service returns.
Printer failure
Payment can often complete without a printout. Offer a digital receipt where available and retain the electronic transaction record. Receipt and tax requirements vary by jurisdiction.
Suspected tampering
Stop using the device, do not dismantle it, notify the provider and manager, compare its serial number with the inventory, preserve relevant logs or footage and follow the incident-response process.
Choosing a terminal by business model
| Business need | Usually suitable setup | Main trade-off |
|---|---|---|
| Pop-up or occasional selling | Phone plus reader or Tap to Pay | Low cost, fewer peripherals and limited redundancy. |
| Small retail store | Tablet or integrated terminal, scanner, printer and drawer | Better inventory workflow with more hardware. |
| High-volume retail | Fixed terminals, scanners, drawers, strong network and spare equipment | Higher capital and implementation cost. |
| Restaurant | Handheld terminals, countertop stations and kitchen integration | Specialized software and support requirements. |
| Salon or appointment business | Terminal or tablet with booking, tips, deposits and customer records | Vertical features may cost more. |
| Mobile service business | Cellular handheld or phone-based acceptance | Battery, signal and device-management exposure. |
| Online and in-store retailer | POS integrated with ecommerce and inventory | Integration quality and vendor lock-in matter. |
| Unattended operation | Rugged kiosk or unattended terminal | Greater security, accessibility and maintenance complexity. |
Integrated versus modular systems
Integrated
- One transaction flow, less double entry and unified reporting.
- Usually easier staff training and support.
- Greater vendor lock-in, bundled processing and dependence on proprietary hardware.
- A software outage can disrupt both checkout and payment.
Modular
- More processor and hardware choice and the ability to replace one component.
- Useful when an existing ERP, accounting or specialist system must remain.
- Requires integration work, more vendors and more reconciliation responsibility.
Questions to ask before buying
- Which chip, contactless, wallet, gift-card, tip, refund and split-payment flows are supported in my country?
- What are the effective processing costs for my average ticket and card mix?
- What software, accessories, support and replacement costs are recurring?
- Can I use another processor, and can I export catalog, customer and transaction data?
- Is the hardware reusable if I cancel, and is there a lease, minimum or early-termination charge?
- What happens during an outage, and what liability remains for offline transactions?
- How are devices inventoried, updated, inspected and replaced?
- Does the system handle cash, exchanges, tax-exempt sales, store credit, end-of-day reconciliation and partial fulfillment?
- Can it scale to more locations, registers, staff, products and integrations?
- Are customer-facing screens accessible and configured to protect privacy?
Frequently Asked Questions
Is a POS terminal the same as a card reader?
No. A card reader reads payment credentials, while a POS terminal may also contain a register, screen and payment software. A full POS system adds inventory, reporting, permissions and other business functions.
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Can a POS terminal work without internet?
Only if the provider supports offline processing or an approved backup connection. Offline transactions can later expire, decline or be disputed, so the merchant remains responsible for the risk.
Does an EMV terminal make a business PCI compliant?
No. EMV helps authenticate chip transactions, but PCI DSS responsibilities still cover the terminal, surrounding systems, accounts, network, staff and operating procedures.
The Bottom Line
Choose a POS terminal as part of a complete payment system, not as an isolated piece of hardware. Match the device to your mobility, catalog, peripherals, connectivity and industry workflow; then compare processing, software, security, support and exit costs together.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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