Connects to any standard serial device via USB Type A Bulit-in COM Port Retention feature allows COM port settings to be stored within the converter USB bus-powered with no external power supply required Compatible with Windows, Mac and Linux operating systems 2 year warranty The Lindy USB to Serial Converter with COM retention allows easy connecction of peripheral devices featuring 9 Way Serial RS232 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 computers  in retail, IT and digital signage scenarios. Thanks to COM Port Retention technology, once the USB to Serial Converter with COM Retentiong has been installed and configured, it can be disconnected from the computer and reconnected to any available USB port on that computer at any time without having to reconfigure your software, saving time.