Abstract: Apparatus for detecting head movement of a golfer relative to an address position. The apparatus includes a movement switch positioned on the golfer's head which provides a signal indicative of head movement from a first position to a second position. The position of the movement switch on the golfer defines the first position as approximately the address position prior to the golf swing. The apparatus also includes a transducer which detects the sound of a golf club striking a ball and provides a signal in response thereto. A microcontroller becomes active in response to the transducer signal and then generates an alarm signal in response to the movement switch signal. In response to the alarm signal, the transducer produces an audible alarm to inform the golfer of the head movement during the golf swing. The apparatus has a housing with a clip for securing it to a hat worn by the golfer.