Brigmton BTDT2-918 Manual De Instrucciones página 23

This symbol indicates that there are important instructions for use and
maintenance in the instructions accompanying this unit.
This symbol indicates that this product incorporates double insulation
between the dangerous supply voltage and the parts to which the user
has access. When servicing the equipment, if you need repairs use only
identical parts.
This symbol on the equipment or in the instructions means that when your
electrical and electronic equipment expires, you must dispose of them
separately from your regular waste. There are special collection systems
for recycling.
For more information, please contact your local authorities or the
distributor from whom you purchased the product.