it is a contraption you use to take off the hardtop in order to use the soft top
www.okorder , under accessories. But for $700, 2 people can do just as good a job
Check Ebay under Mercedes. I have seen them on there before.
I've seen those hoists as well but they usually have to be mounted on a ceiling and are big contraptions. It does take 2 people to lift that hardtop but it can be done in just a few seconds when you do add or remove it. I'd just get a family member or neighbour to help you those 2 times each year you need it.
