This should fall under the must-have shop tools. The iVac Switch works in harmony with your dust collection or vacuum system and an associated power tool. The power tool can range from a high power table saw, down to a low power mini drill. Any power tool that generates dust.
Basically the iVac Switch automatically turns on the dust collection system when you power up your tool and switches off when your done. This eliminates unnecessary noise, power usage and maximizes the efficiency of your vacuum system.
Check it out for yourself.