Fangrui Product Details New And High Quality The Serial Card Adopts M.2 Design, Supports B+m Key Slot, And Is Suitable For 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.