Introducing the cateye isc 12 speed and cadence sensor bluetooth a wireless speed and cadence sensor unit which is compatible with the strada smart computer and can pair to your phone via bluetooth to give you all the readings you want to see the cateye cycling app needs to be installed on to your phone in order for this to work hand in hand dependant on what strada smart bundle you go for you can see heart rate speed cadence power calls and even your email recording your progress is a