An unfortunate downside to conversion beamers is that they are incredibly large and heavy (as they require a number of massive capacitors that line the projection tube) and must remain absolutely motionless when operated, or the intensity of the beam will be negated, rendering the shot useless. Because of this, conversion beamers are usually fitted to self-propelled, wheeled carriages or anti-gravity platforms (the operators will often remain at a safe distance using some form of remote control). Users of the somewhat smaller hand-held versions are forced to wear boots with special claws to provide more stable purchase.