Start/Stop Button: The primary function of a stopwatch is to measure time. Including a start/stop button allows users to initiate and halt the stopwatch's timing functionality.
Reset Button: A reset button allows users to clear the stopwatch and start a new timing session from zero.
Timers: Consider incorporating the ability to run multiple independent timers simultaneously. This feature can be helpful for tracking different events or tasks simultaneously.
Time Display: The stopwatch should prominently display the current elapsed time in a clear and easily readable format. It could include hours, minutes, seconds, and even milliseconds for precision.