ELEGOO 4 Channel Relay Module and 8-Channel Relay Module Bundle, for Automation, Switching Experiments, Control Projects and Electronics Labs

Scale Up Automation ExperimentsCompare 4-channel and 8-channel relay layouts and plan projects that need multiple independently controlled outputs. Includes 4CH Relay Module and 8CH Relay Module 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 8CH Relay Module8-channel 5V relay module for multi-device automation, switching experiments, and control systems.

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.