Described is an apparatus and system for improving the safety of a vacuum device including a first intake cavity, a second intake cavity that can be coupled to a first housing, and a baffle disposed within the first intake cavity to limit the access to the blades of a vacuum pumping device. A slicer produces from the processed signal a pulse signal as an output signal of said adaptive filtering system. When the contact engages the conductive member, the mating portion elastically deflects downwardly at an angle relative to the axis of the body so as to wipe oxidization films that have grown on the mating portion and the conductive member. The stress of the crystalline semiconductor layer is released to provide parallel structures including the two-dimensional material on the crystalline semiconductor layer. This empty GET allows VoIP to pass through strict firewalls that pair each HTTP response with a GET.