Question about Contini Height adjustable office desk

HELLO - HELP does anyone know what exactly the table top of CONTINI 120cm - item 15573610 is made of? The photos are bad - on the white model you can't see the drawer at all - only on the black one you can see it... The description is no better, no functions are explained, but the material GLASS is mentioned? - Is there really white or black glass on it or plastic e.g. Kelco ? - Are there fixed settings, so that the button does not have to be pressed on the head all the time ? - Is there collision detection or does it press the armrest down when there is a chair underneath ; ( LG