# Why your POS must work offline — and how sync works

> A POS that depends entirely on the internet stops selling at every outage. One designed for offline use keeps items, prices and invoices on the device, keeps selling, then uploads transactions to head office automatically when the network returns. Before buying, ask: what happens to sales and stock during an hour-long outage?

Source: https://www.al-arjan.com/en/blog/offline-pos · العربية: https://www.al-arjan.com/ar/blog/offline-pos.md

Author: [AUTHOR_NAME] — 2026-09-26

## How offline POS works

The device keeps a local copy of items, prices and customers, and invoices are recorded locally with unique non-repeating numbers. When connection returns, it sends invoices to the server in order, receives any new price updates, and resolves conflicts with clear rules.

## Questions to ask a vendor

- Do sales and item search continue offline?
- Do receipts print offline?
- How do you prevent duplicate invoice numbers across devices?
- What if a price changes centrally during the outage?
- Does management see each branch’s online/offline status?

## Frequently asked questions

### What about power cuts?

A small UPS for the till and printer is enough to finish open invoices safely.

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