Home / Mobile Stands / Arduino 4 Channel Relay Module Board Arduino 4 Channel Relay Module Board$ 1.46 Add to cart Category: Arduino 4 Channel Relay Module for home automation, IoT and industrial control. Switch AC/DC loads with optocoupler isolation for safety and reliability. Related products Arduino RPM Rotational Speed Measuring Sensor ModuleRead more Arduino 4×4 Keypad Matrix Keypad Membrane SwitchAdd to cart MPU-6050 6-Axis Gyroscope & Accelerometer Module – Arduino, ESP32 & IoT CompatibleAdd to cart Arduino SD Card Reader ModuleRead more