The Safety Siren Pro4 Electronic Radon Gas Detector with digital LCD display continuously monitors Radon Gas with 3 audible alarm modes that alerts you to protect your family from lung cancer from radon gas exposure. The Safety Siren Pro4 Electronic Radon Gas Detector is not like a single use radon test detection kit, this digital radon gas monitor for home testing is a continuous radon tester that performs continuous radon gas monitoring. The easy to read, digital radon level display shows short-term radon levels as well as long-term radon level averages. The electronic radon monitor gives its first radon reading after 48-hours of radon gas sampling. Radon gas in air or water is a health hazard resulting from uranium breaking down in soil. Radon is a radioactive gas that is colorless, odorless, and tasteless and is impossible to detect without the use of sensitive test equipment. Radon gas rises through the soil and seep through cracks, holes and drain pipes in the foundation or basement. Exposure to radon can cause lung cancer. Continuous home radon monitoring is recommended in high radon areas or when radon mitigation systems are used. Radon gas levels change according to humidity and season. Health Canada presently suggests that corrective action be taken to reduce the radon levels in your home if measured over the long term at 200 Bq/m3 or greater.