Sony Xperia XZ2 Manual page 179

Do not place handset on unstable/uneven surfaces. Be extra careful while the vibrator is set.
Handset may drop and cause injury.
Do not use or store handset and related accessories in humid, dusty, or high-temperature
places.
May cause fire, burns, injury, electric shock, etc.
For water resistance, see "Water Resistance/Dustproofing."
Do not allow children to use handset or related accessories in the wrong way. Guardians
should supervise use by children.
May cause injury, etc.
Do not place handset and related accessories within an infant's reach.
May cause accidental swallowing, injury, electric shock, etc.
If skin abnormalities develop, immediately stop using handset and consult a doctor.
Continuing its use may cause itching, rashes, eczema, or other symptoms depending on the user's
physical condition.
For the material of each parts, see "Material List."
Handset temperature may become high when used for a long time or while charging. Avoid
touching handset for a long time involuntarily such as by falling asleep, etc.
While using apps, calling, transmitting data, watching TV or videos, or charging Internal Battery, the
temperature of handset or AC Charger (commercially available) may become high.
Touching a high-temperature area for a long time may cause redness, itching, rash of skin, or
low-temperature burns.
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