RB4K Electric Pencil Sharpener, Reliable, Fast & Quiet, Can be Operated Electrically (Adapter Included), USB port or Batteries - 3 Sharpness Settings (Red) Compact, Portable, Durable, Lightweight Can be operated by using electricity (adapter included), USB powered (cable included) or Battery (battery not included) Three color choices: Black, Red and Light Blue Three sharpness setting from blunt to sharp Safety stop mechanism: Stop when dust box is removed