Super Sonic X10 Swing Speed Trainer, Golf Practice & Golf Training Aid Men & Women SWING FASTER, DRIVE FARTHER: The Super Sonic X10 ingrains a fast, free, yet fundamentally sound swing;Make a measurable increase in your clubhead speed & distance without losing technique or control; Gain yards throughout the bag, driver through wedges SWING SPEEDOMETER: This feature tells you instantly how fast you've swung with a simple MPH digital display reader; A gain of just 4 mph can give you 10 extra yards; The Swing Speedometer will accurately gauge and propel your progress toward a faster, better swing