E-64
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Leaving the watch in an area hotter than +60°C (140°F) for long periods can lead
to problems with its LCD. The LCD may become difficult to read at temperatures
lower than 0°C (32°F) and greater than +40°C (104°F).
Impact
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Your watch is designed to withstand impact incurred during normal daily use and
light activity such as playing catch, tennis, etc. Dropping the watch or otherwise
subjecting it to strong impact, however, can lead to malfunction.
Note that watches with shock-resistant designs (G-SHOCK, Baby-G, G-ms) can
be worn while operating a chain saw or engaging in other activities that generate
strong vibration, or while engaged in strenuous sports activities (motocross, etc.).
Magnetism
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Though your watch normally is not affected by magnetism, very strong magnetism
(from medical equipment, etc.) should be avoided because it can cause
malfunction and damage to electronic components.