Connects two standard serial devices via USB Type A Two 9 Way D Male to 1x USB A Male connector Plug & Play – USB bus-powered with no external power supply required Compatible with Windows and Mac Operating Systems 2 year warranty The Lindy USB to 2 Port Serial Converter allows the user to easily connect two peripheral devices featuring 9 Way Serial RS232 simultaneously to a USB Type A port. With both USB Type A and serial connectors, this device is a perfect solution for connecting legacy RS232 equipment such as barcode scanners and industrial devices to notebooks and Macbooks,  in retail, IT and digital signage scenarios. This converter is compatible with both Windows and Mac operating systems and as it is USB bus-powered, it can be installed quickly and simply with no need for additional power supplies.