SKLZ Portable Multi Sport Radar Measure Your Speed, Improve Your Performance! Measure the velocity of just about any ball you can throw, shoot, kick or hit with the highly accurate Sport Radar. No need to hold the radar. You can use it solo. The Sport Radar sits on the ground or a bench and keeps track of top speed, per session and all-time. Perfect for use behind goals, nets, and rebounders. SKLZ Portable Multi Sport Radar features: Same technology used by the pros Perfect for baseball, softball, soccer, football, tennis, and lacrosse Large, easy-to-read LED display Displays in mph or km/h Durable, portable casing for indoor and outdoor use Clocks speed between 15-150 mph Battery operated (4 C batteries not included) Perfect For Use Behind Goals, Nets, And Rebounders!