Vantec USB To Serial Adapter (CB-USB20SR) Connectors: One USB Type A; One RS-232 DB-9 Male Work with Any USB Compliant System (USB1 or USB2) Provides 96 Byte Buffer For Each Upstream And Downstream Data Transfer Supports RS-232 Serial Interface Bus-powered (No External Power Required). Ideal for Both Notebook And Desktop Windows 98/ME/2000/XP/Vista/7 Compatible