The camera, as a window for the point-reading pen to read the QR code information on audio books, and as an optical device, is the most "exquisite" part of the point-reading pen. Therefore, for the vast number of consumers who buy and use the point-reading pen as a new type of early education product, how to maintain the camera of the point-reading pen has become a crucial issue to extend the life of the point-reading pen. First of all, we should educate children that the point-reading pen camera should not be aimed directly at strong light sources such as sunlight and incandescent lamps, so as not to damage the image sensing device of the camera. Secondly, it is necessary to avoid the contact between the camera and oil, steam, water vapor, moisture and dust, which may corrode the glass part of the camera, thus blurring the "line of sight" of the point reading pen, reducing the accuracy of identifying the QR code and ultimately affecting the learning effect. Thirdly, when the point-reading pen is not in use, the pen tip should be inserted back into the base, so that the base can play the role of lens cover and prolong the service life of the point-reading pen to the maximum extent. At the same time, inserting the used reading pen back into the base can also cultivate children's good habit of doing things from beginning to end. Finally, don't touch the camera of the point-reading pen with fingers, toothpicks and other objects. If the lens needs cleaning, dust can be removed with a soft brush and balloon, and then wiped with lens paper.