I-O DATA USB-RSAQ3 RS-232C Conversion Adapter USB Serial Conversion Adapter USB-RSAQ3 (USB to RS-232C) Connect RS-232C devices to your PC's USB port! USB Serial Conversion Adapter (USB to RS-232C) Please note that the support software (driver) from the manufacturer (I-O DATA) website is not compatible with Win10/11. Since there is no environment to confirm operation, it is being sold as a junk item. (There is information on the internet about it being recognized on Win10... but we have not confirmed this.) There is no outer box or manual, so it will be shipped in simple packaging.