Lenovo Y450 Laptop Lenovo IdeaPad Y450 User Guide V3.0 - Page 53

Using external devices, Warning

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Chapter 3. Using external devices Warning: Listening to music at high volume over extended periods of time may damage your hearing. 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. 44

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Chapter 3. Using external devices
44
Warning:
Listening to music at high volume over extended periods of time may
damage your hearing.
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.
³