I used to hate turning on my shop vacuum and then running the miter saw to cut the board and then reaching up and turning the shop vacuum off for each cut. I plugged it in, connected the miter saw to the main (top) outlet and the shop vacuum to one of the bottom outlets, and now when I pull the miter saw trigger the shop vacuum turns on automatically. Then, after cutting, the vacuum fins are turned off for about 5 seconds thereafter. I love it.