These devices include manual counters, stopwatches, odometers, and digital clocks. Today, it makes chronographs and stopwatches. Common complications include date or day-of-the-week indicators, alarms, chronographs (stopwatches), and automatic winding mechanisms. With the 20H, Longines could produce stopwatches suitable for precise timing in professional events. Extensions have been extensively studied, among them stopwatches, real-time tasks, cost functions, and timed games. For early events, handheld stopwatches were sufficient to provide official timings. Many electronic hand stopwatches display times to the hundredth. The team swam on tables, while utilizing stopwatches.