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 Rs-232db9 Pin Serial Port, 25gb/s Full Duplex Channel Conforming To Pci Express, Supporting Plug And Play. High Speed And Reliable Mission Data Mission Rate Can Be As High As 1000kbps, Support Rs-232 Hardware Flow Control, And Can Stably And Effectively Control Data Flow Loss. Supports Windows 10/7/8/ 98/xp. Colour:green Material:metal, Pcb Package Contents: 1 X Pcie Card Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting 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.