With its 350 watts rated power input the bosch pex 400 ae random orbit sander is one of the most powerful random orbit sanders for diyers it sits securely and comfortably in the hand due to its ergonomic design with softgrip coverings one of the highlights of the pex 400 ae from bosch is its speed preselection this is an advantage especially when working on varnished surfaces if the diyer selects a low speed the surface will not get too hot and the paint on a workpiece will not burn