The Magic House Automatic Pencil senses when you need more lead and automatically advances just the right amount while you write. No clicking, no twisting, no shaking and "NO SHARPENING"
1st Generation: Disposable type, disposed after the lead had finished.
(When the pencil tip move up/down during writing, means that the lead had finished)
2nd Generation: Refillable, replace the lead from the refill tube and continue writing. (When the pencil tip move up/down during writing, means that the lead had finished. Pull out the eraser cap, insert one refill lead into the pencil, cover back the eraser cap and continue to write)