It has two levels of heating, I always use the highest one. It also has a button to switch to cool air, actually it is to shut down the heating parts. The size is small, cute but the noise when heating exist not as quiet as instruction says. Another problem is safety, because the whole body is plastic (maybe ABS), when using long time , the plastic mouth part can be very hot, don't let it contact with any material flammable (such as paperwork).