The Sonoff 4CH PRO (R3) is a versatile and advanced smart relay switch that combines WiFi and RF capabilities. With its 4 channels, this device allows you to control multiple electrical appliances or devices remotely.Equipped with both NO (Normally Open) and NC (Normally Closed) contacts, the Sonoff 4CH PRO (R3) offers flexibility in its usage. Whether you want to turn on or off lights, fans, or any other electrical equipment, this smart relay switch can handle it all.Additionally, this device supports dry contact, enabling you to integrate it with other systems or devices seamlessly. This opens up a wide range of possibilities for automation and smart home applications.The Sonoff 4CH PRO (R3) is designed to provide a reliable and secure connection. By connecting it to your home WiFi network, you can control and monitor your devices remotely using the eWeLink mobile app. This app offers a user-friendly interface, allowing you to easily set schedules, timers, and create scenes for your connected appliances.With its compact and sleek design, the Sonoff 4CH PRO (R3) can be easily installed in any electrical setup. It is compatible with a wide range of voltages, making it suitable for various regions and electrical standards.Overall, the Sonoff 4CH PRO (R3) WiFi + RF smart relay switch is a powerful and feature-rich device that brings convenience and automation to your home or workplace. Whether you want to control your appliances remotely, integrate it with other systems, or create a smart home ecosystem, this smart relay switch is an excellent choice.