Convert the product into a black-and-white hand-drawn line drawing in an industrial design sketch style, preserving the original product's silhouette, structure proportions, and perspective. Use free but precise black lines to outline the main body, emphasizing outer contours, structural transitions, connecting lines, and functional component boundaries. Optionally add a few auxiliary lines, construction lines, and light hatching to convey volume and spatial relationships. The overall effect should resemble an early product concept sketch: white background, black lines, concise and professional, with a hand-drawn design feel.
