The Bushnell Velocity Speed Radar Gun uses digital technology and DSP (Digital Signal Processing) to provide accurate real-time measurements to +/- 1.0 MPH. It features easy point-and-shoot operation and can track the speed of a ball from 100 feet making it the ideal tool for tracking everything from pitching speeds to racecars. Other features: Large LCD display, Requires 2 C batteries (not included), Registers BASEBALL / SOFTBALL up to 110 mph (from 100 Feet Away) and AUTO RACING up to 200 mph (from 1300+ Feet Away).