2. The time for children to operate various electronic video products should not exceed 20 minutes at a time, and the accumulated time per day should not exceed 1 hour.
3. Preschool children should not use electronic products for more than 15 minutes at a time, and the cumulative daily use time should not exceed 1 hour.
4. If it is a child under 6 years old, use electronic products for no more than 15 minutes at a time; If you are a primary school student, use electronic products for no more than 20 minutes at a time; If you are a middle school student, you should use electronic products for no more than 30 minutes at a time. Try not to watch the electronic screen for a long time, and it is best to have a rest every 20-30 minutes.
5. If you are using a Huawei mobile phone, take Huawei P40 mobile phone as an example: click Set Display and Brightness Sleep, and select the corresponding automatic sleep duration on the screen.