Feature:* preset pitching distances of 20', 30', 40', 46', 50', 60 1/2', 70' and 80'. For adults and junior players.* Readings are accurate from 20 to 120 MPH.* Press and release the "Start" button to activate the ball to the "standby" mode ready for pitches.* press "Start" button for more than 3 seconds to change pitching distance.* Countdown immediately starts when the baseball leaves hand..* Automatic power shut-off after 2 minutes if not in use. Battery lasts years.* This is a standard (size and weight) Major League spec. baseball!* Instruction booklet and distance string are included.* With ingenious hand-sensing technology; patent pending (U.S., Japan, Taiwan&China)!* CE approved!