Sony DEV-3 Operating Manual page 3

For customers in the USA
GB
This symbol is intended
to alert the user to the
presence of uninsulated
"dangerous voltage" within
the product's enclosure
that may be of sufficient
magnitude to constitute
a risk of electric shock to
persons.
This symbol is intended
to alert the user to the
presence of important
operating and maintenance
(servicing) instructions in
the literature accompanying
the appliance.
GB