Welcome to our store! 4-Port RS232: The USB to serial adapter features 4 RS232 ports for controlling multiple devices, allowing you to easily connect RS232 devices directly to your laptop via the USB port. COM Retention Function: For added convenience, the USB to serial adapter hub includes a COM retention function, ensuring COM port assignments are preserved across restarts. Compact Design: The COM serial port card has a small design and is USB-powered, eliminating the need for bulky power adapters or outlets. Compatible System: The USB to serial adapter hub supports various systems, including Windows XP, Vista, 10, 8, 7 (32/64 bit), LINUX, etc. Wide Compatibility: The USB to RS232 adapter is ideal for laptops, routers, GPS devices, programming machines, printers, scanners, modems, digital cameras, PDAs, and more. Item Type: USB to Serial Adapter Product Material: ABS Interface: 4 x RS232 Interfaces, 1 x USB Interface Compatible System: For Windows XP, Vista, 10, 8, 7 (32/64 bit), Linux, etc. Package Includes: 1 x USB to Serial Adapter 1 x USB Data Cable If you receive your item and encounter any product issues, such as damage or incorrect quantity, please contact us immediately. We will do our best to provide you with satisfactory customer service.