Connects up to 4 RS-232 devices to your computer at the same time. Stable and reliable chipset Moschip MCS7840. Compatible with USB 2.0 specification. RS-232 DB9 standard specification compliant. Supports transmission rate up to 230-400bps. One USB type B female and four RS232 DB9 pin male connectors available. Power LED indicator available. USB bus-powered and no need external power required for the adapter. Ideal connections to Modem, PDA, GPS, Bar Code, Digitizer, Digital Camera, Label printer & ISDN terminal adapter, etc. Support Windows 2000, 2003, 2008, XP, Vista, 7 & 8, CE 5.0/6.0, Linux Kernel 2.6.x/3.x & Mac OS X 10.4 to 10.8. Package Content: 1X USB 2.0 to 4 Port RS232 Serial Adapter. 1X USB type A male to type B male cable. 1X Driver CD.