If you have filled your dust bin up, and then the cyclone, you know what a miserable way to spend the afternoon it can be. I see Oneida has there sensors on sale for Memorial Day and if anyone needs one this may be as good as a plug and play unit gets. You simply drill a hole into the top of your dust bin and screw the sensor in...that's it. You can do homemade and maybe have a better unit, but this is automatic and works very well (this, from a guy who has sworn to never put another nickel into Oneida's pocket).