These pedals measure power (wattage) from the rider. I paid ~$1,000 them years when I thought I'd continue training another season but never did, and at this point will just use heart rate. The pedals (dual, both sides) have never been ridden with and are new. I recently verified that they communicate and send data to a bike computer and can demonstrate upon request.
Includes two (also new) Look brand sets of cleats ($26 per set on Amazon). They use Look style cleats although I hear Shimano SPD-SL kinda works.