SUPERIOR ACCURACY: Uses Doppler Radar and precise algorithms to show your SWING SPEED, BALL SPEED, CARRY DISTANCE, TOTAL DISTANCE and SMASH FACTOR for each club. Can also use with Tennis, Soccer and Baseball. EASY TO USE: Turn it on, put it down and hit. Powered by (included) batteries. No wifi, no downloads, no apps needed. Captures nearly 100% of shots without "fiddling" with placement like with others INCLUDES EVERYTHING YOU NEED: Batteries, protective case, and instruction manual