Al*****★
NO AUTO SYNC, which means you need to open the app and sync the data yourself when you're near the device, otherwise you don't know what the readings of Radon are. Sorry, but this make the app completely useless. It used to be a better software, and btw a way better support (last time I contacted them, the guy was responding usually after my second message, and it took him a couple of days!) Today I would consider buying a device from another brand