Priebe began his project by sculpting a two-millimeter sheet of brass into a C-shape so that he would be able to slip the weapon onto his hand. Inside the housing, he made a large ring that holds a laser diode from a Casio projector and works as a heat sink. The device runs on 7.4 volts from lithium-ion batteries, which a component called a driver keeps from spiking dangerously and damaging the diode.