In order to keep the users of this radio player safe, there are many symbols that can be found within the users manual explaining the risks of working the product. Inside the users manual, there can be found a triangle with a lightning flash arrow head. That indicates that the item contains presence of uninsulated dangerous voltage. You can also find a triangle with exclemation point inside of it. That signifies that you should read through instructions before continuing to start the product.
And in order to keep yourself safe while taking the product apart, it is imporant to avoid plugging in the radio player while the back is open.
You can find a users manual online with all the relevant symbols avalible.