Samsung Galaxy S4 User Manual page 230

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Seizures or blackouts can occur when you are exposed to flashing
lights while watching videos or playing games for extended
periods. If you feel any discomfort, stop using the device
immediately.
•
Reduce risk of repetitive motion injuries. When you repetitively
perform actions, such as pressing keys, drawing characters on a
touch screen with your fingers, or playing games, you may
experience occasional discomfort in your hands, neck, shoulders,
or other parts of your body. When using your device for extended
periods, hold the device with a relaxed grip, press the keys lightly,
and take frequent breaks. If you continue to have discomfort
during or after such use, stop use and see a physician.
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If your device has a camera flash or light, do not use the flash or
light close to the eyes of people or pets. [122011]
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