The DewStop FS-100 is designed for elegance and performance. This model is for use with any residential fan our customers care to use. The Patent Pending sensor "Condensation Sentry" is at the top. The middle button turns on the fan and the bottom button turns off the fan manually. The sensor needs no maintenance and provides a lifetime of use. Simple to use: Turn on or off the fan needed. The fan control will turn off the fan for you after 30 minutes. The Condensation Sentry sensor will turn on the fan if condensation presents itself at wall accumulating levels. The sensor will bring the condensation level in the room back down and turn off the fan for you. This item is also available in almond (sold separately).