Abstract: Analysis of a swing of a game device such as a golf club is carried out by a first component shaped and arranged to be attached to the club by sliding a slot portion along the tapered shaft to a friction fit at a wider position. The component includes accelerometers and gyroscopic devices the output of which is stored in memory only when an impact characteristic of a golf swing is detected. The raw data on the swing is communicated by wireless to a smart phone carrying an “app” or a program to process the information to generate data relating to the golf swing for showing on the display.