This is the best $22 I have spent as an accessory for my scroll saw!. I was really not happy with trying to hold my wood project with one hand while the blade was running, and reaching up to turn the machine off. This stops the machine instantly whenever you need to. Phone ringing? Need a break? Need to rest a minute? Just lift your foot off the pedal. Your blade comes to a "dead stop". I put my foot switch in a clear plastic bag with a "Velcro one wrap" strap. Keeps the sawdust out of it. I'm sure this is equally valuable for many shop tools.