Refoss WiFi 2-Channel Smart Relay Switch, Max 16A - Smart Home Roller Shutter Control and Light Switch, with Electricity Meter & Bi-Directional Measurement, Local API, Home Assistant, Alexa & Google

• Double control and compact module: a compact 2-channel relay module for independent control of two circuits - ideal for light, sockets and electrical appliances. Thanks to the mini size (43 × 43 × 19 mm), the R21 fits into standard flush-mounted boxes and behind existing wall switches. In addition, the R21 acts as a wireless repeater to improve wireless coverage in the smart home. (Installation requires the connection of the neutral conductor.)
• Precise roller shutter control: Percentage accurate roller shutter and blind control for precisely defined opening degrees - for optimal light, privacy and automation. The R21 is flexible for roller shutters, awnings and bi-directional motors. Automate your roller shutters with Home Assistant: If a door sensor detects opening, the curtain automatically rises up.
• Flexible operating modes: one device, two worlds: switching mode with energy monitoring or roller shutter mode with percentage control - freely switchable without changing devices. Ideal as a smart light switch (e.g. automatic control after sunrise and sunset) or as a professional roller shutter actuator for demanding smart home automations.
• Intelligent energy management: With bi-directional energy monitoring in real time, the R21 measures consumption and feed-in. Both channels are monitored separately and provide clear energy statistics for more efficient energy management. Supports variable power rates, cost forecasts and the export of hourly energy data with approx. 15 days of cloud history. All features are permanently free - no subscriptions. Additionally adjustable: switching state after power failure.
• Open, Local & Safe: Seamless home assistant integration as well as support for open local API, MQTT and webhooks - for real local automation without cloud dependency. Compatible with Alexa and Google Assistant, additionally controllable via a web interface. The R21 offers freely configurable warning functions for overvoltage, over-current, power limits and optional overheating alarms – to protect sensitive and high-quality electrical devices.

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