An overswing alerting mechanism/swing monitoring device that a user can wear, for example on the wrist, hand or arm, that can determine swing formation, and that can display and/or store the determined swing information. As an option, the device includes a visual and/or audible indicator for alerting...http://www.google.fr/patents/US6991552?utm_source=gb-gplus-shareBrevet US6991552 - Swing monitoring device
