Based on your location it seems like you might be looking for the Canadian site.
Would you like to continue, or switch to the Canadian site? - US
Controls & Electrical
Premium Humidity Sensing Wall Control
The new control uses Broan-NuTone’s proven Sensaire® humidity-sensing technology, which can detect a rapid rise in humidity to turn the fan on. It responds to increases in humidity up to 70% faster* than other humidity sensors, ensuring a more comfortable environment following a shower or bath. * compared to competitive models.