VEVOR Carpet Sweeper, 20 cm Sweeping Paths, Floor Sweeper Manual Non Electric, 300 ml Dustbin Capacity with Comb for Home Office Rugs Hardwood Surfaces Wood Floors Laminate, Cleans Dust Pet Hair

Based on the product description, it is suitable for cleaning under furniture. The 180-degree swiveling head and extended handle allow the sweeper to easily reach under furniture like tables and beds.

Yes, it can pick up crumbs.

It is pretty good on area rugs and runners. Don't have any throw rugs I am pleased with the fact that it is good picking up small items like pieces of paper and crumbs.

The handle goes together very easily. Put all the small round pieces together then add the part with the wide part on top as the handle

Attach the slim round ones together and attach to the sweeper. The part with the wide thing is the handle which goes on top for you to hold on to. The little think with teeth on it is to clean the rotator brush underneath. Hope this helps you.