Features: brand new and high quality Compliant with PCI-Express specification Rev 1.1 and PCI-E mini card electrical specification Revision 1.2 for Comply with Full-Mini card type slot specification and industry standard 16C450/16C550 UART The data transmission rate of each interface can reach 230.4Kbps (special models can support 1Mbps) Can be connected to a variety of industrial computer game consoles and other mini itx motherboards to expand serial port devices System Requirements: for Windows Server 2003, 2008, 2012; for Windows XP, Vista, 7, 8, 8.1, 10; Linux 2.6.27, 2.6.31, 2.6.32, 3.x.x and newer Package Includes: 1 Set x Mini PCI-E to Serial Expansion Card Specifications: DB9 Serial Port : 4 Ports On-chip 256-byte transceiver FIFO Support H/for W, S/for W flow control function Support 5-, 6-, 7-, 8-bit serial port format Support None, Even, Odd, Space, Mark parity Supports 1 or 2 stop bits Supports available mini PCI for Express slots Serial Port Cable Length: approx 15CM/5.9in Size: Standard note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.