Overview 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 scanners, point-of-sale systems, touch screens, medical and scientific instruments, industrial process control devices and UPS systems is a breeze. The included 6-foot cable supports data transfer speeds up to 460 Kbpsfour times as fast as a built-in serial port. Five LEDs display port status at a glance. The USA-49WG requires no external power. Windows line monitor and data trace software included. Works with Windows (up to 8.1) and Mac OS (up to 10.11).