The 4 Channel Relay Module is a reliable switching module designed to control high-voltage or high-current devices using low-voltage microcontrollers like Arduino, ESP32, Raspberry Pi, and other development boards. It allows you to safely control appliances such as lights, motors, pumps, and other AC/DC loads through digital signals. This module features 4 independent relays, enabling you to control multiple devices at the same time. With optocoupler isolation, it provides better protection for your microcontroller from voltage spikes. The module supports both high-level and low-level triggering, making it flexible for different project requirements. It is widely used in home automation, IoT projects, robotics, and DIY electronics projects.