The Selectronic S Sensor has a coupled rangefinder, an electronic shutter, and fast loading and rewinding. It has automatic exposure with pre-selected aperture options, making it the high-end Agfa Sensor camera of its time (Sensor Selectonic, Optima 500 Sensor, Optima 200 Sensor, Silette LK Sensor).

It has a very recognizable front face, full of "eyes." From left to right, there is:

- A light indicator used for battery testing and as a trigger indicator when using the self-timer.
- The CdS cell window (with a lens that adapts to the field of view).
- The rangefinder window embedded in the one that illuminates the collimated frame and scales.
- The viewfinder window.

You may say it is illogical to have a multifunctional indicator on the front. But there is a small repeater on the top of the camera body, in front of the Sensor.

At the back, there is a button for testing the batteries (marked "test") and a thread for a cable release. The batteries are located side by side in a drawer on the right side of the body.

Loading a film is facilitated. Opposite the take-up spool, there is a closed receptacle, through which you just have to slide the film leader. The attachment will be automatic. This receptacle helps preserve the shots in case of accidental opening of the back. The Karat/Rapid principle is not far away. After closing the back, you need to arm and trigger three times until the number 1 appears in the frame counter.

Rewinding on this camera is very special. At the end of the film, you need to bring the small "R" lever located to the left of the lens (barely visible in the photo) towards the lens. This reveals a push button that needs to be pressed. Then, you need to actuate the winding lever as if advancing the film, except that with each action on the lever, two frames are rewound. The frame counter shows this clearly. When the counter reaches A, you can open the back.

The viewfinder is clear, slightly purple. A bright frame indicates the infinity framing. At the top of the viewfinder, there is the aperture scale where a tab indicates the one chosen by the photographer, and on the right, the shutter speed scale. A needle is positioned in front of the speed chosen by the light meter. Slow speeds are indicated by a symbol representing a photographic foot. Above the speed of 1/500, a red area indicates overexposure.

This very well-manufactured camera is an excellent simple rangefinder camera.

The Sensor shutter release button consists of a 16 mm diameter orange-colored disc, set within a 0.7 mm high chrome-plated brass collar designed to guide the finger to the center. Below the disc is the button itself, with a very short travel (less than 0.5 mm). A pressure of 300 grams on the plastic disc is sufficient to trigger the shutter. The motion blur caused by the release is thus extremely limited. Agfa will gradually equip all new models with this trigger and make it their number one advertising feature.

The patent corresponding to this shutter release button was filed in Germany in 1968 (published in 1970) under the number DE 1622174, and then in the United States in 1972 (published in 1976) under the number US 3,950,773. The title of this patent is "Operating Means for Photographic Cameras."