<http://schema.org/description>
"If entrance communication is to be integrated into one element, the letterbox door panel provides the basis for a tailor-made solution. It is available in several installation widths and fits flush with the surrounding door panel."^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.architonic.com/it/product/siedle-siedle-vario-door-panel-mounted-letterbox/1124688>