Well from what I have seen, you buy that device and then you install an app on your phone. Surely you could use a firewall on your phone to block outside contac

Well from what I have seen, you buy that device and then you install an app on your phone. Surely you could use a firewall on your phone to block outside contact as the connection between the device and your phone is over a closed bluetooth network. I'm just assuming here that the phone app doesn't self destruct when there is no internet connection.