Interesting consumer-grade continuous radon monitor. Super sensitive large chamber design - as sensitive as professional devices costing as much as $9000. Records and stores up to one year of hourly radon data! Connects to smartphones using Bluetooth. Provides initial reading in as little as 10 minutes. Ideal for radon mitigation diagnostics. This product is ideal for engineers and other data junkies who want lots of data. This product is not C-NRPP certified for professional testing use.