Cheap And Discounts USB to 8-way 8 Channels RS232 232 TTL Serial Port Module CH348 Multi Ways Type C to 8-way UART HUB PCB Expansion Board YR-6018 Wholesale. Buy Directly From Merchant EC-buying Technology Co., Ltd. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.