Safety vacuum cleaner for the construction site and workshop "Safe Plus". With Smartfix (rail for systainer connection), 2 velcros, antistatic hose. For the toughest heavy-duty continuous use. For connection to the powertool and direct vacuuming during drilling, milling, grinding and sawing, concrete, plaster, stone, cement, wood, paints and varnishes (hazardous dust, dust class "H"). A highly intelligent electronics measure the current occupancy state of the filter (pressure difference meassurement "PDM"). Once the factory preset vacuum value is reached, both of the filters are alternately cleaned within 3.5 seconds using high performance electromagnets, without interrupting work. Even the most fine and problematic particles of dusts - such as plaster - can be easily removed from the filters.