These products are guaranteed to work with your HP DeskJet 640C printer.
Hp deskjet 640C comes with model number as 0725184329272. It has wired connectivity technology with USB and parallel interface. Its print speed is up to 6.0 pages per minute for colour printing and for black and white printing its speed is 3.0 pages per minute. It has curved media path and handle following media type like plain paper, iron — on transfers, glossy paper, photo paper, transparencies, business cards and envelops whose maximum media size is 8.5 inches x 14 inches. It has total media capacity of 100.0 sheets. It consumes 2.0 watt power in both sleep and standby mode.