The ball may be an LED - the game is purely mechanical (powered by a wind-up mechanism)

The ball may be an LED - the game is purely mechanical (powered by a wind-up mechanism) http://www.boardgamegeek.com/image/237354 German box. the text reads: Reaction - Concentration - NEW! Playable WITHOUT TV set http://www.boardgamegeek.com/image/236691 Game Front - Turned Off http://www.boardgamegeek.com/image/60431