DewStop turns your bathroom fan on when moisture is present and off when dry. Works with ANY ventilation fan to help you save time and money. DewStop includes adjustable humidity sensitivity settings so that you can tailor your fan to your rooms particular climate. DewStop also includes a 0-60 minute timer and manual on/off control all in one switch! Settings are concealed beneath a cover, making it great for property management and parents. DewStop’s sensors help prevent mold and mildew by turning your fan on automatically, even if your family forgets to.Replace any existing switch – use with any decora style wall plateWorks with any ventilation fanAdjustable humidity sensitivity settings, 0-60 minute timer, and manual on/offProtects your room from humidity and condensation – automaticallyQuick, easy installation – installs in 5 minutes watch the install video in image sectionReplace your existing fan switch with DewStop and your fan is now a smart fan