A-rival Teasi Core Guide De Démarrage Rapide page 23

5. Installation on your bycicle
5.1 Installation of Teasi Core
Fix Teasi Core on HR bracket as shown in the figure below.
5.2 Installation of speed/cadence sensor
Install pedals magnet (RPM) and wheel magnet (Speed) in
corresponding positions as shown in the figure below:
Tear the 3M adhesive on the back of pedals magnet off and stick
pedals magnet inside the pedal connecting arm, and then tie up the 2
nylon straps to fix it, and cut unnecessary part down.
Install the wheel magnet on wheel spoke and tighten it, so as to
ensure that it will not slide when the wheel is spinning at a high speed.