Its also optional if you just use it as ant+ power meter (i.e. not using the advanced metrics)
https://www.pioneerelectronics.com/ephox/StaticFiles/PUSA/Files/Cycle%20Sports/Pioneer%20Cycle%20Sport%20Quick%20Guide%207-7-16.pdf
cadence detection won’t be as good, but good enough. (basically like all other accelerameter cadence detection