I used to use a CooSpoo speed/cadence sensor.
Usually worked good unless the battery was getting weak.
Always try a new battery no matter how new you think the battery is.
I bought a batch of batteries and 3 0r 4 out of the 10 were dead out of the package.
Boughy real cheap from Amazon or Ebay.
Now, I pay more but just get 2-4 at a time from the local store.
Ant+ always seems to be less of a head ache.
Ant+ seems to work better as the battery is getting weaker or cold.
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