The Kodak Instamatic 400 was an early model of Kodak's Instamatic camera series for Kodak's easy-to-use cartridge 126 film. It was made from 1963 to 1966 in Rochester. It has a film advance system with spring motor, a built-in pop-up flashbulb holder, and a built-in electric eye for automatic exposure control. The essential parts are the f8 41mm 3-element lens and the two speed shutter with speeds of 1/40 and 1/60 sec. A warning bar is visible through the viewfinder when light is not sufficient. It needs two AAA batteries for firing flash bulbs.