Hi ladies :

Ever since I purchased my OV watch I have been nothing but fertile. It must be my Good luck charm. I have never used it. I did open box and read instructions however. The sensor is brand new. There is an expiration on bottom of box and it's expiring at the end of the month. I am sure it's still good. Worse case scenario maybe you would need a new sensor. Does anyone want it? All I need is shipping or you could come pick it up. I live in Oceanside. I would hate for it to be a total waste of $$$. Good luck to everyone :)