With the Broan-NuTone® Digital Dehumidistat Humidity Sensing Wall Control Switch for ventilation fans, you can turn any ordinary bathroom fan in a humidity sensing fan. Just set the easy-turn dial to whatever percentage of humidity you want, and the dehumidistat will turn the fan on when it senses that your bathroom is rising above that threshold. With an optional “always on” mode, the digital dehumidistat is an easy solution to ensure that your bathroom always stays properly ventilated. Its bright white design and LED light match with any modern décor and will upgrade the look, feel and functionality of your bathroom!