The Echo 8 cigarette lighter camera was made in Japan in the 1950s. Sliding open the top of the lid revealed a viewfinder, and lifting the lid revealed the shutter release. A small metal door on the side of the lighter opened when the shutter release was pressed, and closed after a photograph was taken. Alongside the windscreen was a recessed film advance wheel, which could then be turned. After twenty photographs were snapped, it would turn freely, letting the spy know that it was time for a new roll. (The camera used 8mm film.) You could even adjust the aperture and exposure with small levers. And yes, the lighter was fully functional.