Goal lights may be mounted to protective glass around the rink or to a 1" pipe (not included). Press the goal judge switch to alert fans of each goal. The Pro Model Hockey goal light features two rotating beacons that signal when a goal is scored along with a green light that comes on at the end of each period. The Varsity Model Hockey goal light functions just like the Pro model, but has a single red light to indicate a goal and a green light to indicate the end of a period or when the clock reaches zero.