This is a gold plated USB to TTL module serial port converter UART electronic kit. It features a high-quality yellow needle arrangement and has a power light PWR, as well as TXD and RXD indicator lights. The module supports 3V3 and 5V selection and is compatible with a range of Windows operating systems, including 98, ME, 2000, XP, Server 2003, VISTA, Server 2008, Win7, and Win8, in both 32-bit and 64-bit versions.