Happy to change my rating if I can get this water sensor to work. Out of the box, the battery was dead and had to buy a battery (CR2 Lithium are not cheap). The water sensor just won't sync to my 2.4GHz WIFI very standars ASUS router. I've tried Easy Mode and AP Mode. The App does not have an icon for the Water Sensor Device. I am very disappointed in this Water Sensor Device and Greeni App.