Lenovo K920 Smartphone - Manual (Page 15)

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Operating temperature
Be aware of heat generated by Lenovo Phone. When using Lenovo Phone,
keep it away from hot or high-voltage environments, such as electric
appliances, electric heating equipment, or electric cooking equipment.
Use Lenovo Phone only in the temperature range of -10°C (14°F)—45°C (113°F)
to avoid damage.
When Lenovo Phone is turned on or the battery is charging, some parts might
become hot. The temperature that they reach 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. Avoid
keeping your hands, your lap, or any other part of your body in contact with a
hot section of Lenovo Phone for any extended time.
Protecting your data and software
Do not delete unknown files or change the name of files or directories that were
not created by you; otherwise, Lenovo Phone software might fail to work.
Be aware that accessing network resources can leave Lenovo Phone
vulnerable to computer viruses, hackers, spyware, and other malicious
activities that might damage Lenovo Phone, software, or data. It is your
responsibility to ensure that you have adequate protection in the form of
firewalls, antivirus software, and anti-spyware software and keep such
software up to date.
Keep electrical appliances away from Lenovo Phone, such as an electric fan,
a radio, high-powered speakers, an air conditioner, and a microwave oven.
The strong magnetic fields generated by electrical appliances can damage the
screen and the data on Lenovo Phone.