The perfect home based pitching machine throws small whiffle balls at various speeds and angles. Pitch Indicator Light (patented) ... helps players develop timing necessary for hitting with power to all fields. Pitch Isolation Training... select your problem pitch and eliminate your weaknesses. PRO Model allows you to use PIT. Commonly used in the Major Leagues, PIT is a technique using a pitching machine (or pitcher) to throw nothing to a batter except one type of pitch...Pitch Isolation..., so that the batter can concentrate on the mechanics, including bat angle and point of contact, needed to create a positive result, NOT a strikeout! This forces the competition to use other pitches as an "out" pitch, which increases the batter's likelihood for success. With the technology provided in the PRO...its ability to throw consistently accurate curveballs, fastballs and sliders...the PTS package specifically, YOUR son or daughter can practice JUST LIKE the PROS, and reach the next level more quickly! - Quad Speed (20, 35, 45, & 55 mph) - Holds 100 Balls - Includes 4 dozen balls - 2 Year Warranty - AC Adapter/Charger - 4-Hour Battery