The Lot of 5 SIIG JJ-E40011-S3 CyberPro PCI Express x1 Serial Adapter Cards are universal serial cards designed for use with SIIG products. These serial cards provide a single port for connecting serial devices and are compatible with PCI Express x1 slots. Manufactured in Taiwan, these cards are a reliable and efficient addition to your computer's interface capabilities. Please note that this product contains a chemical known to the State of California to cause cancer, as indicated by the California Prop 65 Warning.