Abstract: A device that provides an output at the instant that peak velocity is reached. It is comprised of two main components, namely an acceleration detection switch connected in series with another acceleration detection switch.

Abstract: A golf swing training device. The training device provides audible indications of the orientation of the club face as it reaches a point where a ball would be positioned, thereby helping a golfer develop a swing where the club face meets the ball squarely. The audible indication tell the golfer if the club face is open, closed, or square to the ball at the moment of impact. An unsmooth swing can be detected during upswing or downswing, and an indication of such is provided. A pendulum is provided in the club head with a pair of sensors located on either side of the pendulum to sense the position of the pendulum. A velocity switch senses the peak velocity of the club and activates an electronic circuit at that point so that outputs of the pair of sensors provide data which indicate the orientation of the club face at the moment of peak velocity. The audible indication of the club orientation is provided based upon the output of these sensors.