The main control chip adopts WCH ch382l chip, which has strong compatibility and is suitable for long-time operation. Physical serial port with interrupt address, high stability. Standard interface external dual -232DB9 pin serial port, 25gb/s full duplex channel conforming to PCI Express, supporting plug and play. High speed and reliable transmission data transmission rate can be as high as 1000kbps, support -232 hardware flow control, and can stably and effectively control data flow loss. Supports 10/7/8/ 98/xp. Colour:green Material:metal, PCB Package Contents: 5 x PCIe Card 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.