Balls pitch every 7 seconds Easy pitch angle adjustment Red light flashes to indicate pitch release (6) Aero-Strike plastic baseballs Baseball bat sold separately Build your Little Leaguer's hand-eye coordination anywhere with this portable electronic pitching machine. The pitching machine can be easily adjusted for different pitching angles and warns you before pitches (every seven seconds) from the telescopic ball feeder via a red flashing light. Four D batteries are required (sold separately). The machine includes six Aero-Strike plastic baseballs-the only balls that can be used in the set.