This adapter card can connect four standard DB9 pin RS232 serial ports through the M2 slot of the computer. Users can connect four devices with RS232 serial ports at the same time for data transmission.It has electrical performance design, which not only ensures stable and fast communication capability, also provides users with low-cost, high-performance and standard compliant solutions.It is mainly used in embedded , such as serial port network, data acquisition (DAQ) system, system, industrial control and building automation equipmentColour:As ShownMaterial:ABSPackage Contents:1 x adapter cardOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.