Complete system consists of, Strobe unit 20 foot target cable, target box, mini tripod, and (2) batteries.
Simply install the batteries, attach the target box to your steel target, and connect the strobe to the target box using the target cable.
Download the manual for the Target Impact Signal System III here.
Power: 2 AA 1.5v batteries
Time to first flash, Position 1: 6 sec. Time to next flash < than 6 sec Time to first flash, Position 2: 8 sec Time to next flash: < than .5 sec Time to first flash, Position 3: 8 sec Time to next flash: < than 1 sec Flash visible to: > 1400 meters (1531 yards)