Operating a press can be physically and mentally demanding, and sometimes tedious. Printing machine operators are on their feet most of the time. Often, operators work under pressure to meet deadlines. Most printing presses are capable of high printing speeds, and adjustments must be made quickly to avoid waste. Pressrooms are noisy, and workers in certain areas wear ear protectors. Working with press machinery can be hazardous, but accidents can be avoided when press operators follow safe work practices. The threat of accidents has decreased with newer computerized presses because operators make most adjustments from a control panel. Many press operators, particularly those who work for newspapers, work weekends, nights, and holidays. They also may work overtime to meet deadlines.