The DC 12V 4-Channel Relay Module is a compact relay interface board designed to control multiple AC or DC loads using Arduino, PIC, AVR, ARM, DSP, PLC, and other microcontrollers. It features 4 optocoupler-isolated channels, low-level trigger inputs, and individual relay status LEDs for easy monitoring. Each relay supports up to 250V AC/10A or 30V DC/10A, making it suitable for home automation, industrial control, lighting, motors, pumps, and DIY electronics projects.

The 12V 2 Channel Relay Module with Optical Isolation is a dual-channel relay board designed to control electrical loads using microcontroller signals. It features photocoupler isolation, low-level triggering, status LEDs, and separate VCC/JD_VCC power connections for improved control and interference protection. Each relay supports up to 10A at 250V AC or 10A at 30V DC, making it suitable for Arduino, ESP32, automation, robotics, home control, pumps, motors, and lighting applications.