Propeller works best with accurate data from both a rescue and a controller medication.
Most people are prescribed one inhaler for rescue use. If you have a few (keep one at the office, one at home) then two sensors might work best for you. Sensors can switch from one medication to another, so if you just switched from one brand to another, but don’t take them at the same time, you just need one sensor.
Same goes for controller medications – most people have one. If you’ve got multiple different types (Diskus and Respimat, for example), we would recommend putting sensors on all of the ones you take regularly.
Keep in mind that the Propeller sensors attempt to sync with your phone every few hours, so if your backup inhaler(s) aren’t nearby frequently, we might start to bug you about not hearing from that sensor.
If you’re still not sure, reach out to us. We can help you figure out how many sensors you’ll need.