
The M5Stack Unit RFID2 uses the WS1850S NFC/RFID controller and operates at 13.56MHz, providing read/write support for proximity/IC/NFC cards and non‑contact two‑way magnetic induction. It's a compact, stackable M5 module aimed at access control and IoT projects, but it offers no functional improvements over the previous RC522-based unit and has limited manufacturer documentation for the WS1850S.
For makers and integrators who need a compact 13.56MHz read/write M5Stack module; avoid if you require well-documented, low-level chip SDKs.
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