Welcome to our store! EXPANSION SERIAL PORT: This 4-port RS232 serial controller card expands one M.2 port into four RS232 serial ports, providing more serial ports for industrial control devices. HIGH-SPEED TRANSFER: The M.2 controller card supports high-speed data transfer rates, ensuring stable and fast data transmission to meet the demands of industrial control equipment. COMPATIBILITY: The M.2 4 serial port controller card is compatible with a variety of operating systems, including Windows and Linux. It is suitable for a wide range of industrial control equipment and compatible with existing systems. EASY INSTALLATION: The adapter card adapter is easy and convenient to install, requiring no additional drivers, plug and play, saving users time and effort. DURABLE: The M.2 4 serial port controller card is made of PCB material with excellent durability, which can run stably for a long time and extend the life of industrial control equipment. Item Type: M.2 to 4-Port RS232 Serial Card Adapter Material: PCB Adapter Type: M.2 to 4-Port RS232 Package Includes: 1 x M.2 to 4 Port RS232 Serial Card Adapter Guaranteed Satisfaction: Customer satisfaction is our top priority. If you find any problem with the product, please contact the seller immediately. We strive to provide satisfactory after-sales service.