There have been reviews that say the watch is just as accurate as a chest strap, and reviews that say it isn't, so we probably won't know until we get more people testing. One review said it could connect to a Bluetooth chest strap, and one of the guided tour videos showed a section for Bluetooth medical devices (or something like that, don't remember the exact wording) when connecting a Bluetooth headset, so I think it's pretty likely that it will work.