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This is Xiaomi Watch S4 Sport (model M2315W1), a premium sport smart watch with eSIM independent calling, running Xiaomi HyperOS 2 wearable system. It receives regular official OTA firmware and security updates, supports encrypted Bluetooth, cellular and cloud communication as well as local storage encryption. It adopts Mi‑account‑bound pairing authentication, has brute‑force protection for pairing attempts and partial local security event logging. Its titanium alloy shell raises tampering difficulty; known vulnerabilities are limited and patched timely by vendor.
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