The USA-49WG Keyspan® High-Speed 4-Port USB-to-DB9-Serial Adapter Hub allows you to connect as many as four 9-pin serial devices to a computer or laptop with a USB Type-A port. An easy and inexpensive way to add serial ports to your computer without hassle, the USA-49WG works with any DB9 serial device. Configuring and sharing data among multiple modems, GPS devices, cellphones, hand-held s ...