The idea was to create a Taser system that could be effective in the intermediate range (30-100 feet) where a regular handheld Taser could not reach, but from which thrown projectiles could still be a viable threat against someone.
Ultimately, the project was a commercial failure, primarily because of the cost of the cartridges. At something like $125 each, they were nearly five times the cost of regular Taser ammunition.
I remember reading about cops throwing a flash bang into a toddlers playpen and burning them.