This item is a high-quality power supply. It is ideally suited as a replacement or secondary device and provides your R542U with power just like your previous power supply, enabling reliable battery charging. Quality is our top priority. This means that this power supply for the R542U model is new and unused. Our own quality assurance ensures a high standard of quality. Unless we explicitly state that this is an original item, we provide a compatible product. This means it is not an original from the manufacturer and is therefore not produced or recommended by them. All brand and product names belong to their respective owners and are used only for compatibility description.