Lenovo IdeaPad S10e 4187 User Manual page 48

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.
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Lenovo IdeaPad S9e and S10e User Guide