Bosch 3931A Airsweep 120-Volt 13-Gallon Wet/Dry Vacuum Cleaner with Power Broker Bosch exclusive Pulse-Clean electromagnetic filter cleaning system shakes the dual filter cartridges to remove dust and maintain maximum suction power. Pulse-Clean can be activated manually or automatically, when a connected power tool is switched off Elevated filter location filters sit above maximum dust or water accumulation height to help maintain maximum airflow and suction power 4 Modes of operation: regular vacuum, power tool activation, pulse-clean, pulse-clean with power tool activation Activation by power tool allows power tool switch to turn vac on and off. 7-second run-on after power tool is turned off to clear hose of remaining debris Power broker dial for allocating power between vacuum cleaner and connected power tool to optimize usage of the available power and avoid blown circuits. Also allows suction control for other purposes as well