<b>Charging instructions</b><br><br> 1. The charging interface is the Android access port. Use USB when charging or plug the USB port into the power adapter to charge. <br> 2. The signal light is in the blue steady state and the charging is normal. When the signal light is off, it means the battery is full. <br><br> <b>Instructions for use</b><br><br> 1. Open the protective cover. <br> 2. Press and hold the button, the eraser starts to rotate, and it can be erased by rotating back and forth in the area to be rubbed. <br><br> <b>Replace the eraser</b><br><br> 1. After the rubber is worn, pull out the rubber jacket. <br> 2. Then pull out the eraser 3mm. <br> 3. To use the φ2.3mm eraser, replace the plastic rubber jacket. <br>