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Sonoff RFR3 Intelligent Switch Supports Alexa Voice Control M5 Stack SERVO2 Module 16 Channels - 13.2 (PCS9685) and RC racing enthusiasts relySonoff RFR3 Intelligent Switch Supports Alexa Voice Control The Sonoff RFR3 is an advanced RF controlled intelligent switch that integrates seamlessly with Alexa voice assistants, enabling remote on off control of electrical appliances through both wireless RF commands and voice activation. Professional electricians, home automation integrators, and IoT technicians use this device to retrofit existing electrical installations with smart control