How to Use: Guidelines for sharpening pens 1. Open the battery cover on the back and insert the batteries in the correct direction (install 2 AA batteries) or use a USB DC power supply (select output 5V2A adapter head) 2. Please make sure that the pen scrap cover of the sharpener is buckled in placebefore use, the sharpener will not operate when it is not in place 3. Insert the pencil into the pencil sharpener hole, hold the pencil firmly while keeping downward pressure, the pencil sharpener starts to sharpen the lead 4. After the lead sharpening time is maintained for 2‑4 seconds, when you feel relaxed, it means that the sharpening has been completed, and the pencil is pulled out 5. Only suitable for standard wooden pencil (6.5‑8mm diameter) sharpener Instructions: 1. One‑handed press 2. Strong power 3.3 seconds to complete Tool core replacement method: 1. Unscrew the lid of the crumb box at the top 2. Pull out the knife core protection frame by hand 3. Take out the knife core 4. Install the new knife core and restore it Clean up the waste: 1. Unscrew the upper cover counterclockwise 2. Remove the upper cover together with the knife holder 3. Dump waste 4. Screw the upper cover clockwise Specification: Item Type: Electric pencil sharpener Material: ABS, silicone and carbon steel Function: Easy to use, compact and practical Product Size: length: 7cm / 2.8in, width: 7cm / 2.8in (manual measurement, there may be slight errors) Applicable Pencil Size: 6.5-8mm ordinary pencils, triangle rod, hex rod, round rod, color lead, and sketch can all be done Battery Model: 2 AA batteries (delivered without batteries) Package List: 1 x Sharpener 1 x Knife Holder