Cheap And Discounts DC 3.3V/5V/12V/24V Digital Logic Level Conversion Module PNP/NPN to NPN PNP MCU PLC IO Switch Signal Isolation Protection Board Wholesale. Buy Directly From Merchant Shop1104009202 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.