Minimalist design with modern technology. The Square Bathroom Exhaust Fan with Adjustable Speed and Humidity Sensor from Aero Pure can blend in with various settings while maintaining the air quality of your bathroom. It has an integrated humidity sensor. You can adjust the relative humidity level in your bathroom so that when the humidity level rises above that threshold, it automatically turns on. The fan has three different speeds, which can be adjusted, and it’s powered by a DC brushless motor for quietness, longevity, and energy efficiency.