Features: Brand new and high quality The serial card adopts M.2 interface design, supports B+M key slot, and is suitable for various types of motherboards. It has four RS232 serial ports, which can connect multiple serial devices at the same time. Adopt high-quality chip and circuit design to ensure stable data transmission and reliable working performanceS. High-speed transmission: Support high-speed transmission rate to meet the demand of data transmission. Suitable for servers and other devices, used for serial port control and communication. Industrial automation system: suitable for serial communication and control in industrial automation system. Electronic equipment maintenance: suitable for electronic equipment maintenance personnel to communicate with serial port equipment. Specifications: Material:PCB Size:Approx.80x22mm/3.15x0.86inch Package Includes: 1x Serial Card note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.