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Specifications: Product Name: Electric pencil sharpener Product Dimensions: 102L X 77W X 162H mm Unit weight: 490g(approximate value) Pencil diameter: Suitable for 6-12mm pencils Long using-life:(5000 times) Power Apply: 18650 rechargeable battery Battery: 3.7V 2000mAH (input:5V/1A) Package: 1*Electric pencil sharpener with USB cable 1*18650 rechargeable battery 1*Operating instruction 1*Small cleaning brush Warm Tips: ❤ Please charge the battery first when received the product. Take out the USB cable from the lower box, and connect the USB port to charge the battery. ❤ Please note the pencil sharpener can't work when it is charging. ❤ Please hold and press down the pencil slowly until the sharpener stop working. ❤ If the voltage of battery is too low, it will start to self-protection immediately. The red LED light will start flashing once per second for two minutes. And it won't be restarted within two minutes. ❤ This product can constantly work for 5 minutes, reuse it need to wait for 10 minutes. ❤ There are three situations when charging the battery: (1) The LED light will be bright red while the battery is charging. (2) When the voltage of the pencil sharpener reaches the point where the pencil can be sharpened, the LED light will flash twice per second. (3) The LED light will go out if fully charged.