Profoto Acute-B 600, 600 watt Second Battery Operated Flash Generator. Up to 160 full power flashes from a single battery cassette Fast recycling: 0.09 - 2.6 sec Motion-freezing flash durations: 1/1000 - 1/6800 sec Full 7 f-stop range in 2/10 step adjustments Special 65 W modeling lamp (with the brightness of 90 Watt)