buttonpresetlock s, button/ generallockinformation
using the button lock
deactivates the other buttons so they are not activated accidentally.
to activate / deactivate the button lock, press
display: 
appears if button lock active.
take care when using headphones
hearing safety: listen at a moderate volume. using headphones at high volume can impair your hearing.
traffic safety: do not use headphones while driving or cycling as you may cause an accident.
general maintenance (see figure 5)
to avoid damage or malfunction:
–do not expose to excessive heat caused by heating equipment or direct sunlight.
–do not allow the psa to be submersed in water. do not expose headphone socket or battery compartment to water as water entering the set may cause major damage.
–do not use any cleaning agents containing alcohol, ammonia, benzene, or abrasives as these may harm the set.