What should I do when the mouse cursor does not move smoothly and accurately?

In this case, you'd better calibrate the product. Place the Powerpoint Presenter on a horizontal and stable plane, then simultaneously press the left mouse button and air mouse button for 2 secs. Blue indicator flashes mean the product has been in the calibration mode, then unclench your hands and try to keep the product still. If the blue indicator flashes 3 secs and goes out after 5 secs lighting, it shows that your calibration has been completed.