Welcome to our store! The expansion card is compatible with PCI‑Eepress 1.0 a standard, making the product reliable to use. PCI‑Express speed is up to 2.5Gb/s, which can ensure stable and fast work and greatly improve our work efficiency. The product is compatible with 16c550 UART standard and 256-byte transmit and receive. The expansion card supports remote wake-up and power management functions, convenient and practical. The serial expansion card supports MODEM modem signal CTS, DSR, RI, DCD, DTR, RTS, RS232 level conversion. The product is widely applicable to industrial computers, communication, medical equipment, LED control. Item Type: PCI‑E 2 Port Serial Expansion Card Material: PCB Color: Black Chip: WCH382L Transmission Type: PCI-E to 2xCOM FIFO High-speed Data Transfer Rate: Up to 250k/sec Support RS-232 Hardware Flow Control Data Bit Length: 5, 6, 7, 8 Equipment Requirements: An available PCI-Express card slot System Support: For Windows98/98SE/ME/2000/xp/Server 2003/xp 64bit/ Vista/ Win7/2008, Linux, OS X, etc. Applications: Industrial computer, communication, medical equipment, LED control, POS machine guest display, engraving machine, engraving machine (such as: pickup, map king, etc.), stamp clock, telephone program control machine, telephone billing unit, serial mouse, flashing machine Use, POS serial printer, access control and attendance, single-chip microcomputer, serial connection equipment, serial network/monitoring equipment, data acquisition system, POS terminal and industrial PC, parallel port/print port application, additional I/O card-Serial/Parallel /USB, embedded system I/O expansion, PLC design and simulation, etc. Other 9-pin serial port general equipment. How to use: 1. Open the computer case and remove the rear baffle 2. Insert the riser card into the corresponding PCI-Express card slot 3. Turn on after installing the chassis, read the driver disk, and use it after installing the driver 1 x Expansion Card 1 x Driver Disk Customers are our top priority. If you find any problems with your product after receiving it, such as damage or incorrect quantity, please contact us immediately. We strive to provide you with the best customer service.