This colorful screen features no radiation, no glare, no blue light, and no harm to eyesight. Children use it to doddle for a long time, it will not do any harm to the eyes. The built-in battery provides 100,000 times writing and drawing on the writing tablet, it can be replaced and used continuously. Avoid paper wasting and no mess at home. we added a screw to the battery lock to prevent children from swallowing unknown parts.