Fan IO helps you stay cool and comfortable during indoor training sessions such as cycling, running on a treadmill, or a rowing machine. It uses Bluetooth-enabled sensors and HomeKit to control one or more fans based on your heart rate or body temperature, ensuring that you have an optimal workout experience. Simply set your preferences, and let Fan IO do the rest. Note: to use this app you need at compatible Heart Rate monitor and at least one compatible fan or Smart Plug configured in HomeKit. Now uses HomeKit for connecting to and controlling user selected outlets in addition to the Bluetooth-based Smart Plugs