PROFESSIONAL: The Pencil sharpener is professionally suitable for round, hexagonal, triangular wooden colored pencils, NO.2 and HB pencils, and also suitable for wooden eyebrow pencils. It has a built-in sharp steel blade and a high-speed motor. It is powerful and can sharpen a brand new pencil within 5 seconds without damaging the pen tip. DUAL MODE OPERATION: Electric mode - Use 2 AA batteries(not included), press the pencil to start working efficiently, and automatically sharpen the pencil, enough to easily sharpen your pencil in 3-5 seconds. When the battery is not installed, it is in manual mode, just put the pencil in the sharpener and rotate it. PORTABLE: The Portable Pencil Sharpener is a portable small size. The palm-size is easy to carry and avoids the trouble of USB cable entanglement. It is very suitable for Offices, Schools, and Homes. It is the best choice for Teachers, Artists, Children, Kids, and Adults. EASY TO USE: Hold the pencil sharpener with one hand, hold the pencil with the other hand and extend it into the pencil sharpener. The pencil sharpener will work automatically. You will rely on sight, sound, and a bit of feel to determine when the pencil is sharp. When the sharpening sound changes and the resistance of sharpening decreases, your pencil is sharpened.