High capacity automatic feeders automatic feeders work with all Rawlings Pro Line two and three wheel pitching machines. The turret design holds more balls in a smaller space than any other system. Balls may be laced or dimpled, but must be regulation size. Release interval is fixed at 5 seconds. A wireless on/off remote control is included with all automatic feeders.Please note that the automatic feeders will not work for balls thrown upward (slow pitch softball or fly balls) because balls are not fed with enough momentum to roll up the machine's inclined ball feeder tube.