This Marsona 1200 (Alternately branded as the Invento Sound-x) is fully functional and in good condition.
The Marsona 1200 is an analog noise generator with a simple filter to create different noise colors (white to pink), as you would find on an analog synthesizer. The noise is modulated to simulate rain, waterfalls, and surf. There is a knob to select between these sounds, as well as knobs to change the surf rate, surf range, tone, and volume. There is an onboard speaker and 1/4" output jack.
Start a noise/drone band or catch some Z's; I frequently use the pink noise "Waterfall" setting at low volume when I sleep!