and high quality The serial card adopts M.2 design, supports B+M key slot, and is suitable for various types of motherboards. It has four RS232 serial ports, which can multiple serial devices at the same time. Adopt high-quality chip and circuit design to 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. Different batches may have different appearance, which does not affect use. Color: Black Material: PCB+electronic components Package Contents: 1 x M.2 to 4x RS232 Serial Adapter Card 4 x RS232 Serial cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.