The gist is pretty simple. When you shoot the target, your rounds hit the target, creating a shockwave that propagates predictably away from the impact location. You mount several inexpensive sensors to the target and wire them up to a target timer system. The target timer system creates a precise timeline of when the shockwave hits each sensor and reports that to a computer (e.g. your laptop or cellphone). The computer churns through the calculations necessary to plot this impact location and voila–an electronic target system.