SPIN remote SDC-1 is meant to be a smart home device controller. To that end, support has been built-in for devices like Philips Hue and LIFX lamps, Sonos speakers and many more to come. These smart devices communicate through WiFi. There's no WiFi antenna inside the SDC-1 because of power usage considerations, so in these cases the app on your smartphone/tablet acts as a bridge. That's why the bluetooth connection to the SDC-1 needs to be active.