Installation relies on a smooth, dry surface without grout. On non-porous materials such as glass, mirror, polished metal, stainless steel, plastic boards, or tile, the organizer adheres securely. If the initial attempt fails, wash the suction cup, dry it with a hair dryer, and test it on a clean, smooth area; if the suction holds, the wall is likely suitable, otherwise try a different location. There is no drilling, glue, or tools required, and the unit can be repositioned after installation. To use, press the board firmly onto the surface until it engages securely; the suction cup can be removed without leaving marks, enabling height and position adjustments. The suction assembly uses a TPE cup with a design inspired by octopus tentacles and an ABS plastic hook, optimized for weather resistance and longevity, performing across a wide temperature range. Made from rust-resistant stainless steel, the shelves provide durable storage and quick draining through all-around drainage, promoting air flow to keep items dry. With space for shampoo, shower gel, cosmetics, conditioner, and soap, plus two large hooks for razors, towels, or brushes, this organizer fits in bathrooms, kitchens, RVs, and other humid spaces. Color: Black.