Feature: 1. SERIAL PORT EXPANSION: The 4 port RS232 serial controller card expands one M.2 port into four RS232 serial ports, providing more serial ports for industrial control devices. 2. HIGH SPEED TRANSMISSION: M.2 controller card supports high speed data transmission rate, ensuring stable and fast data transmission to meet the demand of industrial control equipment for data transmission speed. 3. COMPATIBILITY: M.2 4 serial ports controller card is compatible with a variety of operating systems, including for Windows, for Linux, etc. It is suitable for a variety of industrial control equipment and compatible with existing systems. 4. SIMPLE INSTALLATION: The adapter card adapter is easy and convenient to install, no need for additional drivers, plug and play, saving users' time and effort. 5. DURABLE: M.2 4 serial ports controller card is made of PCB material with excellent durability, which can run stably for a long time and prolong the service life of industrial control equipment. Specification: Item Type: M.2 to 4 Port RS232 Serial Card Adapter Material: PCB Adapter Type: M.2 to 4 Port RS232. Package List: 1 x M.2 to 4 Port RS232 Serial Card Adapter