Swing Whistle is a golf swing training device that attaches to your own club, teaching proper timing and tempo. Swing Whistle alerts the user as to where they spend power, while taking practice swings or hitting actual golf balls. If a player "casts" or comes "over the top" the whistle is heard early in the swing. The goal is to get the whistle to occur at impact to provide maximum efficiency and effective clubhead speed. Swing Whistle is one of the few products on the market that allows the player to train their swing using their OWN equipment.