For best battery life remove the Priya Sensor when your period starts, for periodic cleaning (at least every 29 days), and for sexual intercourse if desired. You do not need to turn off the Sensor when you remove it for periodic cleaning and intercourse but it should be removed, turned off and stored in its case during the length of menstruation to maximize battery life.
Never expose or submerge your Priya sensor to or in boiling water. Priya Sensor should also not be placed in the dishwasher, the microwave or in boiling water! Doing so will void the warranty.
For cleaning instructions, check out this article. How do I clean my Priya Sensor?
While inserting the Priya Sensor, twisting the sensor should be avoided! See this article for tips on How to Insert the Priya Sensor!