The cap feels hot on my head, is it safe to use?
It is normal for the REVIAN cap to generate some heat. The cap was subjected to safety testing to ensure the temperature never reaches unsafe levels. Additionally, the REVIAN cap has a temperature sensor built in so that if the temperature reaches a certain point the power level will be reduced, and if the cap temperature reaches a higher level the app will alert you that the treatment cannot continue until the cap cools off. This is often dependent on the ambient temperature.