The Twilight Tracer Flashing Golf Ball. $21.43.
‘The official size and weight of the U.S.G.A and R&A, the Flashing Golf Ball has a tough Surlyn cover and a super-bright internal LED that flashes for five minutes after contact. It has a battery life of 80 hours, which will keep you flashing (as it were) for about 1000 strokes!’