StarTech.com 2 Port USB to RS232 Adapter / 2 Port USB Hub. Data transfer rate: 480 Mbit/s. Weight: 290 g. Dimensions (WxDxH): 100 x 60 x 20 mm, Connector(s): 2 - USB A M, 1 - USB B, 2 - DB9 M, 1 x 5v DC 1.2 AMP. Compatible operating systems: Windows 98SE/ME/2000/XP/Windows Vista