Their print is usually indistinguishable from and often finer than that of a good typewriter. Although laser printers have a higher cost per page, their speed and quality surpass that of most dot-matrix printers. Both types of printers can print graphics. Other types of printers include daisy wheels, ink jets, and thermal transfer. Color monitors are more expensive, often two to five times the price of a similar monochrome monitor.
Different people find the different kinds of monitors to be more or less straining to their eyes.
Monitors can be equipped with screens to cut glare or reflections. Monitors connect to computers through video interface cards, which must be matched to the monitor type. A modem is a device that allows the computer to communicate with other computers over a telephone line. This way firms can help a client through a problem on his or her own computer screen. For example, a typical 2400 baud modem transmits about 240 characters per second over the telephone line.