The Smart Switch will automatically turn on/off the fans according to your settings; or you can manually turn the fans on/off ANYTIME and from ANYWHERE. In real time, you can read the current temperature/humidity at your bin site, change your settings, or simply monitor the current conditions. Used for natural air drying and to maintain market value while storing. Other applications include livestock barn fans, pivots and hay storage. You will need a Smart Phone and WiFi at the bin site. You can purchase a hotspot from your cell phone provider for WiFi. A free downloadable app from STEPS GMS is available to monitor it from anywhere.