The trackle sensor is made of medical-grade silicone. As part of our certification, we had the material tested for cytotoxicity and genotoxicity in an external laboratory. The material is completely inert (chemically inactive) and contains no cytotoxic or genotoxic substances. 

So it does not react with your mucous membranes in any way. 

The basal body temperature values are only transmitted when the sensor is in its box. So you don’t have to worry about radiation inside your body!