The film is loaded into the removable back of the 'watch' and made light-tight by a rotating plate. Attaching the back to the camera rotates this plate and moves a circular aperture to lie behind the lens. When the release trigger is pressed a second plate in the camera rotates until an aperture is behind the lens, the shutter then operates. After exposure the plate returns, as it does, a spring loaded claw on the plate engages the film holder in the back and advances the film.

Various coloured watch straps exist, some models were sold in presentation boxes.

The camera was designed by Rudolf Steineck who later designed the Tessina.