If you're connecting Bluetooth Smart devices to Zwift via ZwiftIOS, Zwift tvOS, or even the Zwift Mobile Link - There's no need to "pair" these like traditional Bluetooth devices under system settings. You need to let the application you're using take care of it. Much easier! :)
Links:
ANT+ / Bluetooth Connection Primer: • Bluetooth Smart vs ANT+ : Connectivit...
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