Improve your pitching and swinging speeds with this Net Playz Personal Sports Radar, which features durable black rubber construction. It tells you hands-free from 0 to 150 miles per hour exactly how fast you're pitching, enabling you to practice alone. The bright LED display can be seen from a distance and this sports radar also boasts handy voice notifications. Dimensions: 6.75L x 4.5W x 6H in.. Durable black rubber construction. Hands-free speed measurement from 0-150mph. Bright LED display with voice notifications. Requires 5 AA batteries (not included).