This CH340G/CH340E USB to TTL converter module is a reliable and high-quality solution for UART communication. Featuring the original CH340G chips, which are the official USB-to-TTL chips recommended by STC, this module ensures stable compatibility without issues that may arise from varying drivers or different computer systems. It is built with high-quality yellow pins, which are more durable and aesthetically superior to those found in lower-quality black market versions. The module includes power (PWR), TXD, and RXD indicator LEDs, making it easy to observe the operation and functionality without needing additional instruments. The 3.3V and 5V outputs can be selected via a jumper, providing versatility for different projects. It supports a wide range of Windows operating systems, including Windows 98, ME, 2000, XP, Server 2003, Vista, Server 2008, and Windows 7/8 (both 32-bit and 64-bit versions).   Specifications: Chip: Original CH340G (USB to TTL converter) LED Indicators: PWR (Power), TXD (Transmit), RXD (Receive) Voltage Options: 3.3V and 5V (Selectable via jumper) Operating System Compatibility: Windows 98, ME, 2000, XP, Server 2003, Vista, Server 2008, Win7, Win8 (32-bit/64-bit) Pin Quality: High-grade yellow pins, more durable than typical black market versions Power Supply: Powered via USB connection