After pressing and holding the knob for 3 seconds, the LED display lights up. Then, twist the knob to vacuuming. This resin dust collector adopts stepless speed regulation design, with a total of 30 gears. The maximum speed can reach 4500 RPM, and the working noise is as low as 50 db. It can adapt to different resin grinding requirements, easily handle rough grinding and fine grinding, and a quiet and clean working environment This resin vacuum dust collector is equipped with a reusable HEPA filter screen, which can collect more than 99% of the epoxy resin dust and various small dusts. And it is easy to clean. A brush is included in the package. You can simply brush it or use a hair dryer to restore it to like new This resin dust collector features a 360° surrounding air duct design. It can comprehensively and powerfully absorb resin dust when you are drilling, grinding, and polishing resin, so as to reduce air pollution, avoid inhaling dust into the mouth and nose, and can effectively keep the desktop clean, helping you reduce subsequent cleaning work 9.45 x 8.27 x 2.76 inch / 24 x 21 x 7 cm. The operating area is 9 x 6.3 inch / 23 x 16 cm. It is specially designed for the grinding, polishing, and drilling work of small and medium-sized resin crafts. It is comfortable to use, the body is , easy to place and the desktop, and suitable for DIY and professional workshops, Weight: 2.15832554498 Pounds, Manufacturer: Tuidzljd