ELEGOO 4-Channel Relay Module and UNO R3 Board, for Automation, Switching Experiments, Control Projects and Electronics Labs

Control More Outputs with ConfidencePair a controller with relay hardware for automation demonstrations, switching practice, and multi-output control projects. Includes 4CH Relay Module and UNO R3 Board in one convenient project combination.; What You Get from 4CH Relay Module4-channel 5V relay module with optocoupler isolation and status indicators for low-voltage control of higher-load devices. It helps users build practical skills instead of only reading theory, making each lesson easier to test, modify, and understand.; Why Add UNO R3 BoardUNO R3 compatible controller board with USB cable for programming, testing, and module control.

The added hardware gives you more room to expand, repeat, compare, or share projects without stopping for missing essentials.; Practice Multi-Output ControlLearn low-voltage signal control, channel-by-channel switching logic, indicator feedback, and automation layouts for demos, labs, and custom control systems.; Made for Real Learning, Not Just UnboxingIdeal for students, teachers, hobbyists, and makers who want reusable hardware for many projects. For relay projects, high-voltage or high-current wiring should be handled only by qualified adults; always follow electrical safety rules. Drivers, libraries, example code, or IDE configuration may be required depending on your computer and project.