Features: brand new and high quality Using high-quality PCB board, high temperature and cold resistance, long-term use without deformation, thus ensuring long-term stability. Adopt immersion gold process, good conductivity, anti-oxidation, ensure good contact and improve data transmission rate. Full duplexs and half duplexs switch at any for time is fast and convenient. PCIEX1 to RS232/485 serial port card, requires the motherboard to have a standard PCIE slot. Ensures long for lifetime and better work performance. Specifications: Material:PCB Size:Approx. 120x105mm/4.72x4.13 inches Package Includes: 1x Expansion Card note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.