Radon is an odorless, colorless, radioactive gas that has been found in homes all over the world. It comes from the natural breakdown of uranium found in the soil and can enter the house through tiny cracks and holes in the foundation. Long term exposure to radon is a health risk that can be mitigated by ventilation once its presence has been determined. These test kits come in a variety of testing vial options, with easy to follow instructions. Send in your kit. Results and a detailed explanation will be mailed to you. Your information will also be accessible on the web (your kit will include instructions on this option).