The product is a vintage Microsoft Windows 95 Upgrade OS with CD-Key, designed for retro software enthusiasts from the 90's. This companion CD includes the English language version of the operating system, suitable for use with Microsoft Windows 95. The model number for this product is MICROSOFT RM4-B5, originating from the United States. Perfect for those looking to experience the nostalgia of 90's computer technology with a touch of Microsoft's iconic operating system.Untested and unverified!