Forget static tees and the light lobbing of baseballs, the Japanese "Jet Hitter" allows batters to hit a floating baseball.
It's actually quite an interesting concept. Not only does it allow the batter to practice by themselves, but it closely mimics a real pitch. The ball wobbles a little, forcing the batter to concentrate more, and it allows the batter to hit at a wider angle.
The newest version brings three changes to the "Jet Hitter." The first is the use of a bucket feeder; the second is the use of a "swing arm" that brings the ball out at a 90-degree angle, and thus cutting the interval between balls from 11 seconds to 5; and the third is a wider nozzle to help prevent the batters from hitting downward.
The added bonus is that it offers significantly less danger than traditional batting machines, in that it offers….no….danger. Unless it explodes.