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 decor and will upgrade the look, feel and functionality of your bathroom. Turn any ordinary fan into a humidity sensing fan - reduces mold and improves air quality Precision control with a user adjustable knob that allows you to set at what humidity level you want the fan to start running at Allows for continuous ventilation to meet code requirements in certain markets LED lights indicate whether or not the fan is running Switch fits in a single gang box for ease of install