The M850 digital clock chronometer has a two-button control system, setting operations are identical for both alarm and time setting. The universal time is in a 24 hour format, while local time can be set to 12 or 24 hour format. The incandescent high-contrast display is readable in bright sunlight.Version850-28Vhas orange incandescent 28V lighting and N size alkalinebattery memory.This is a 2-1/4 inch front panel mount instrument.