The Vintage Microsoft Home Mouse Serial DB9 C3KKS3 61402 is a tested and working serial mouse from Microsoft. This classic mouse is perfect for retro computing enthusiasts or those looking for a reliable and straightforward input device for a legacy system. With its serial connection, it is compatible with a range of older computers that require a traditional mouse with a DB9 port. The Microsoft brand ensures quality and performance, making this vintage mouse a dependable choice for everyday use.