Cheap And Discounts 5V 12V 24V Relay Module With Optocoupler Relay Output 1 2 4 6 8 16Way Relay Module For Arduino PLC Automation Equipment Control Wholesale. Buy Directly From Merchant EARU AUTO . Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.