The D1000 is a 1000 watt-second fan-cooled pack, fully microprocessor controlled with output that is variable in 1/10 f-stop increments, over its entire 5.8 f-stop range. Power output is displayed on a 1/2 inch tall LED display. It is easily visible from many feet away under normal room lights. The D1000 has misfire alarms. Sync voltage is compatible with most digital cameras. The D1000 supports four modeling lamps, each up to 250 watts, for fabulous pre-visualization.