Brand New and High Quality This serial card uses an M.2 design, supports B+M key slots, and is suitable for various motherboard types. It features four RS232 serial ports, allowing simultaneous connection to multiple serial devices. Utilizes high-quality chips and circuit design to ensure stable data transmission and reliable performance. High-Speed Transmission: Supports high-speed data transfer to meet your needs. Suitable for servers and other devices for serial port control and communication. Industrial Automation Systems: Ideal for serial communication and control in industrial automation systems. Electronic Equipment Maintenance: Suitable for personnel maintaining electronic equipment to communicate with serial port devices. Note: Different batches may have slight appearance variations, which do not affect usage. Color: Black Material: PCB + Electronic Components Package Contents: 1 x M.2 to 4x RS232 Serial Adapter Card 4 x RS232 Serial Cables Only the above package content is included. Other products are not included. Note: Light reflections and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3 cm.