Lenovo U110 U110 Lenovo Safety and Warranty Guide V1.0 - Page 32

Lenovo SWG V1.0.book Page 24 Friday, February 29, 2008 1:39 PM Using headphones or earphones If your computer has both a headphone connector and an audioout 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 earphones and headphones output voltage and therefore the sound pressure 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. 24 Lenovo IdeaPad Safety and Warranty Guide