Hand held computer displays height and hang time for one jump, ground contact time for one jump and average height and hang time for four jumps. Computes foot quickness (shuttle runs and dashes) and explosive leg power rating. Records 60 jumps, then averages heights, contact times and leg power for first and last 15 jumps, in addition to a fatigue factor rating. Extremely accurate and eliminates guesswork. Portable, easy to operate, sets up in seconds. Use for testing athletic performance as well as charting rehabilitation. Battery operated, 1 year warranty. (27″ x 27″ mat with hand held computer)