Lenovo A516 User Manual page 12

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 Lenovo Phone
complies with EN 50332-2 Sub clause 7. This
specification limits Lenovo Phone'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.
If Lenovo Phone came with headphones or earphones
in the package, as a set, the combination of the
headphones or earphones and Lenovo Phone already
complies with the specifications of EN 50332-1. If
different headphones or earphones are used, ensure
that they comply with EN 50332-1 (Clause 6.5
Limitation Values). Using headphones that do not
comply with EN 50332-1 can be dangerous due to
excessive sound pressure levels.