The 4 Channel 5V Relay Module (Isolated Control) is designed for reliable switching of AC and DC devices using low-voltage signals from Arduino, Raspberry Pi, PIC, ESP32, and other controllers. Each channel comes with optocoupler isolation for improved safety and noise immunity, making it ideal for IoT automation, robotics, smart home systems, and industrial projects. This relay module can handle lights, fans, pumps, motors, and other appliances, giving users in Bangladesh a compact and versatile control solution. Built with LED indicators and screw terminals, it ensures both ease of use and professional-grade performance.