17. DO NOT use it after eating, when you are tired, when you have just exercised or when
your physical state is abnormal. ---- May cause damage to health.
18. DO NOT use it while eating or doing other activities.
19. DO NOT use it when your senses blunt after drinking alcohol. --- May cause accident or
injury.
20. DO NOT use it when there are hard objects in your trouser pockets. ---- May cause
accident or injury.
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