These are Marshall Stockwell speaker shelves
The shelf has two positions.
When storing the speaker in the rear position, it allows you to store, for example, a mobile phone or tablet in the front part.
However, if your phone or tablet runs out of power, you can move the speaker to the front, making the USB-A output available for charging. Both positions have a ready outlet for mains power.

You can also color the inscription as you wish. It is plastic