Each relay control has its own red indicator LED. The green LED indicates the VCC supply voltage status. The driver transistor (PNP) has a 1 kΩ resistor. Relays rated 10A. The relay coil supply voltage is 5VDC. Control is done by connecting the INx pin to the GND pin. The relay changes state and the red LED of that relay lights. Current then flows through the pin approx. 4mA.

Note! Not for professional use. Do not use to control mains-voltage equipment. For use only with voltages under 50VAC/DC.