Thank you for viewing. This is a set of a Logitech keyboard and mouse. I used it for about two years, but there are no noticeable stains or key malfunctions. I am selling it because I purchased a different one. Full-size wireless keyboard and mouse set, Windows compatible. - Brand: logicool - Product type: Wireless keyboard and mouse set - Model name: MK345 - Supported OS: Windows - Features: Full-size keyboard Included items - Mouse - Computer keyboard - USB wireless receiver