Dust-Free-System-without-Tool-Air-Electric-Sealey-DFS91B-Tough-composite-bin-&-motor-housing-are-suitable-for-industrial-bodyshop-applications-Fitted-with-microchip-controlled-electric-&-air-supply-circuit-which-monitors-power-air-to-the-power-tool-&-automatically-activates-the-suction-The-same-microchip-overruns-the-suction-by-10-seconds-to-clear-the-hoses-of-dust-Features-vibration-function-that-helps-clear-dust-accumulated-on-the-filter-bag-after-use-Supplied-with-a-combined-air