While radon is a naturally occurring radioactive gas, high concentrations of radon gas in the home can be hazardous to you and your family"s health. Radon can seep into your home"s basement or crawl space through cracks in the foundation or walls, openings or spaces around sump pumps and drains, or construction joints or flaws. The First Alert radon test kit is listed under the EPA radon gas measurement proficiency program and can be completed in as few as two to three days. Included in the cost is the lab fee for an EPA listed lab and a return mailer. The test results are returned to you within 72 hours of lab receipt, and include the recommended next steps you will need to ensure the health of your household. --Bree NorlanderWhat"s in the Box Charcoal activated test kit, user"s manual, and return mailer