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, Â 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.