Lenovo IdeaPad U110 - Manual (Page 7)

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When your computer is turned on or the battery is
charging, the base, the palm rest, and some other
parts may become hot. Avoid keeping your hands,
your lap, or any other part of your body in contact
with a hot section of the computer for any
extended length of time. When you use the
keyboard, avoid keeping your palms on the palm
rest for a prolonged period of time.
Your computer generates some heat during
normal operation. The amount of heat depends on
the amount of system activity and the battery
charge level. Extended contact with your body,
even through clothing, could cause discomfort or
even a skin burn. Periodically take breaks from
using the keyboard by lifting your hands from the
palm rest; and be careful not to use the keyboard
for any extended length of time.