Lenovo Horizon 27 Table PC IdeaCentre - Manual (Page 21)

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Safety and warranty guide
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.
Cleaning and maintenance
Keep your computer and workspace clean. Shut down the computer and then
disconnect the power cord before cleaning the computer. Do not spray any liquid
detergent directly on the computer or use any detergent containing flammable
material to clean the computer. Spray the detergent on a soft cloth and then wipe
the computer surfaces.
Using headphones or earphones
If your computer has both a headphone connector and an audio-out connector,
always use the headphone connector for headphones (also called a headset) or
earphones.
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 headphones 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 specification
limits the computer’s maximum wide band true RMS output voltage to 150 mV. To
help protect against hearing loss, ensure that the headphones or earphones you
use also comply with EN 50332-2 (Clause 7 limits) for a wide band characteristic
voltage of 75 mV. Using headphones that do not comply with EN 50332-2 can be
dangerous due to excessive sound pressure levels.