1. Sharpened within 4S and work well for colored pencils, lead pencils, charcoal pencils. 2. Insert a pencil and press it down, then take it out after few seconds with perfect tip. 3. Opening top lid will auto-stop working to prevent fingers being hurt. And inner overheating protection device will reduces machine damage. 4. Fit for pencils with diameter 6-12mm. 5. Battery is not included here.