Once you figured out the problem you can remove the sensor from the water and wipe off the sensor with a dry cloth or towel.
Flip power switch on the left side of the unit to the off position. Please, be sure to flip the switch to the “on” position when you’re done or you won’t have a functional unit in the future.
If you are hearing more of a chirp coming from your unit, it is notifying you of low batteries. There is a low battery LED status light on the front of the unit that will confirm your batteries are low. You will also hear this alarm if your batteries were not installed correctly.
Either replace your batteries or install them correctly and when you turn your unit back on, the low battery LED status light should no longer be blinking and the chirp will no longer sound.