# Impinj: How RAIN RFID systems work

> Primary technical explanation of passive RAIN tags, readers and software, non-line-of-sight reading, and the relevance of metal and liquids. No advertised range, rate, cost, accuracy or efficiency claim adopted.

Canonical page: https://datacenterlabeling.com/references/s43

Original source: [Impinj: How RAIN RFID systems work](https://www.impinj.com/products/technology/how-do-rain-rfid-systems-work)

## Scope of this source

Primary technical explanation of passive RAIN tags, readers and software, non-line-of-sight reading, and the relevance of metal and liquids. No advertised range, rate, cost, accuracy or efficiency claim adopted.



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## Related guidance

- [Choose barcodes, RFID, or AIM for the evidence you need](https://datacenterlabeling.com/guides/rfid-aim-or-barcodes)