In electrophotography, the developer is a consumable that acts as a charging agent. It has magnetic properties that allows it to carry toner particles until they are transferred to the photoconductive drum or belt. It may also be called carrier. In mono-component systems, the toner and developer are mixed together (in desktop laser printers, for example). A dual-component system (like the Xerox DocuTech) keeps the toner and developer separate.