Oomi Water Sensor uses CR123A batteries that can be replace if your Water Sensor ever runs out of power. You can replace the battery if you separate the battery cover from the Sensor unit. Below are the instructions for opening up the Water Sensor to replace the battery:
a. Pull open a small gap between the battery cover and Sensor unit.
b. Push or move your fingernail along the gap between the battery cover and Sensor unit.
3. Once the battery cover is separated from the Sensor Unit, you can pull out and change the battery located in the center of the Water Sensor 6 hardware.