I had the same problem, on the smart b+ sensor you need to configure the rollers you are training on, for the real turbo muin b+ this is 8x flikkering of the light.
inside the sensor there is a small button witch you have to push untill it flashes 8 times in a row,
it takes a while, first time you push 1x, second time you push 2x, you have to go on untill 8 flashes,