M850 Digital Clock Chronometer | 2-1/4in, 28V NVG Incandescent, 24 Hr BatteryThe 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. Version 850 28V NVG 24 has green A night vision compatible incandescent 28V lighting, 24 hour battery, and N size alkaline battery memory. This is a 2 1 4