ITEM NAME:2x USB to TTL UART Module CH340G 3.3/5V Serial Converter Switch ReplacePL2303 SE.2 x USB to TTL UART Module CH340G CH340 3.3V 5V Serial Converter Switch. Built-in USB to TTL Transfer chip. Designed to be used for USB to TTL electronic projects. TTL interface output, easy to connect to your MCU.