Wi-Fi carries the heavy lifting in a smart breaker: high-speed cloud communication for remote control, live current/voltage/power telemetry and over-the-air firmware upgrades. Bluetooth 5 (LE) handles the first-mile problem — fast, offline-friendly commissioning when there is no router on site yet.
The two modes complement each other. Wi-Fi offers tens of metres of range and high bandwidth; BLE pairing takes seconds at close range and survives network changes. Dual-mode devices fall back gracefully: if the router reboots, the breaker keeps running its schedule locally and re-syncs when the network returns.
For specifiers the practical takeaway is simple: dual-mode devices deploy faster (no app-to-router-to-cloud dance on site), recover faster (BLE keeps local control alive), and upgrade faster (OTA over Wi-Fi once commissioned). CNMIBO smart breakers ship with dual-mode pairing on the Tuya and Mijia platforms.