Lenovo ThinkCentre M91 - Manual (Page 11)

DANGER
Outdoor antenna
grounding If an outside antenna or cable system is connected
to the equipment, be sure the antenna or cable
system is grounded as to provide some protection
against voltage surges and built-up static charges.
Lightning For added protection for this equipment during a
lightning storm, or when it is left unattended and
unused for long periods of time, unplug it from the
wall outlet and disconnect the antenna or cable
system. This will prevent damage to the video
product due to lightning and power line surges.
Power lines An outside antenna system should not be located
in the vicinity of overhead power lines or where it
can fall into such power lines or circuits. When
installing an outside antenna system, extreme care
should be taken to keep from touching such power
lines or circuits, as contact with them may be fatal.
Data safety
Do not delete unknown files or change the name of files or directories that were
not created by you; otherwise, your computer software might fail to work.
Be aware that accessing network resources can leave your computer vulnerable
to computer viruses, hackers, spyware, and other malicious activities that might
damage your computer, 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 this software up to date.
Using headphones or earphones
If your computer has both a headphone connector and an audio line-out
connector, always use the headphone connector for headphones (also called a
headset) or earphones.
CAUTION:
Excessive sound pressure from earphones and headphones can cause
hearing loss. Adjustment of the equalizer to maximum increases the
earphone and headphone output voltage and the sound pressure level.
Therefore, to protect your hearing, adjust the equalizer to an appropriate
level.
Excessive use of headphones or earphones for a long period of time at high
volume can be dangerous if the output of the headphone or earphone connectors
do not comply with specifications of EN 50332-2. The headphone output
connector of your computer complies with EN 50332-2 Sub clause 7. This
Chapter 1. Important safety information
7