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SW1 900A (5V) is a high-performance wireless relay switch designed for remote control applications. Operating at 5V, it allows seamless integration with microcontrollers such as Arduino and ESP8266. The module provides stable and efficient switching capabilities for home automation and industrial control systems. It supports multiple input/output configurations, making it highly versatile. Its compact design ensures easy installation in embedded projects. The module features built-in protection against overvoltage and short circuits, improving reliability. It is commonly used for smart lighting, motor control, and security systems.