Despite your Hewlett Pack colour laser printers best efforts, it simply cannot fuse every grain of toner powder to paper, and this toner powder has to go somewhere. The original CE265A waste toner collection unit is Hewlett Packard`s solution to this.The majority of the leftover toner powder within your HP Colour LaserJet CP4525n (and all other compatible printers) is funneled off to one side and packed into this CE265A collection box. The genuine Hewlett Packard waste toner collection bottle is essential in keeping your printer pristine and ensuring the very longest life from this important part of your office.