Let's see, my last sensor fell off after 4 days. The sensor before that fell off after 2 days. Previous to that the sensors lasted 9 to 12 days as normal. It has been a long time since the sensor lasted 14 days. The company knows about this problem, it is not new! I am saving them for any lawsuit initiated by our Government who supply them free for now. I feel no need to send them back and go through the BS and my cost to return when they certainly know about this problem and say screw you to the users. User's recommendation: If you are paying full cost for the product, LOOK OUT>.