The Automatic Vacuum Switch by 4SMARTSPACE is a power tool activated on/off control designed for woodworking equipment. This switch offers convenience and efficiency by automatically turning on and off the vacuum system based on the power tool's activation. It is a reliable and practical addition to any woodworking workshop, allowing for seamless integration of the vacuum system with the work process for improved safety and functionality. hook it to your sander or mitersaw or tracksaw and when you turn on the tool it will turn on your vacuum automatically. when you turn off the tool the vacuum runs for a few seconds longer to clear out the hose and then shuts down. PAT Tested.