Hardware
How barcode scanning works in a POS
Updated 2026-09-11
What a barcode does at the till, when to use a dedicated scanner, and when a phone camera is enough.
A barcode is a product identity the till can read faster than a human can type. In a POS, scanning looks up the item in your catalog and puts it on the bill. It does not magically know price unless you already stored that product.
Dedicated scanner vs camera
A USB or Bluetooth barcode scanner at a grocery till is built for speed and a dirty counter. The Android camera is the fallback when you do not have that hardware yet — useful for a small general store or for adding products, slower than a scanner in a rush.
QR codes work the same idea: a code in, a product out. Use whatever the pack actually prints.
What has to be true in software
Scanning only helps if:
- The product exists in the catalog with that code
- The selling unit on the bill is the one you meant
- Hardware is compatible with the device
BezPOS supports external scanners and camera scanning on supported Android devices. Compatibility still depends on connection type. A scanner that types like a keyboard on Windows may behave differently on a phone.
Printers are a separate problem
Receipt printing is not the same as scanning. A printer must be visible to the operating system or app connection you use. If Windows does not see the printer, the POS cannot invent it.
For shops moving off handwritten bills, scanning plus offline billing is usually the first visible speed gain.