A typical electrically heated, tempered backlight is described and its merits listed. Design criteria including line or stripe spacing, width, and location, together with bus construction and electrical reinforcement are discussed. Defogging and deicing capabilities are reviewed. Variations in power output with ambient temperature are particularly noted. This new product appeared on some 1968 American automobiles as an option, and on additional 1969 models. It is an important contribution to safety because of improved visibility to the rear.