Accordingly, in the process of exploitation fax periodically need to replace these supplies. However, unlike the fuser toner and opc drum for laser fax machines are designed a few thousand copies, and the replacement of the drum is made in 3-5 changes of toner, so the cost of copies obtained in this apparatus is substantially lower than in the case of thermal transfer fax. And if we take into note that any fax machine has a copy function and can be used also as a copy machine, laser fax machines are the most preferred for use in the office for medium and large workflow. The cost of laser fax machines has steadily decreased, which also contributes to their spread. For example, the simplest model of Panasonic KX-FL403 costs less than $ 300 and allows you to receive copies of standard resolution of 600 x 600 dots per inch, has increased the rate of data reception (up to 14400 kbit / s) and print speeds up to 10 pages per second. Slightly more expensive fax KX-FLC413, which included besides the usual have a wireless handset dect. In operation of these devices is also very burdensome: once in about 2000 copies to replace the toner, and a 10000 – drum set, supplies for 10000 copies would cost about $ 200 Another group of devices which we will – so-called multifunction printers (MFPs) – devices that combine several functions in one unit – a printer, copier, scanner, telephone, fax and answering machine and sometimes a modem. .