A fuser unit is comprised of a pair of rollers that heat and fuse the respective toner to the page being printed to create the desired image. The particles of toner powder are pulled onto the paper creating the desired result as the paper passes the image drum. The Brother LR2242001 fuser unit is compatible with a variety of printers. To find out if it is compatible with your printer, simply scroll to the bottom of this product page to find a comprehensive list of products that work alongside this unit.