Complete system consists of, Strobe unit 12 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 I here.
Power: 2 AA 1.5v batteries
Time to first flash: 2 sec
Time to next flash: < than 2 sec Flash visible to: >1000 meters (1093 yards)