Why we picked it
Lifters, rowers and HIIT athletes who find chest straps uncomfortable but want near-strap accuracy and multi-device broadcasting
What to know before you buy
No HRV or running dynamics, the small charging cradle is easy to lose, and the standalone recording still relies on Polar Flow for review; battery is far shorter than a coin-cell chest strap
Key specs
- Optical HR sensor worn on upper arm or forearm; DC Rainmaker found it matched chest straps in running and cycling tests with only ~5 s lag on hard intervals
- Up to 20 hours per charge (rechargeable, 16 MB memory holds ~600 hours of workouts)
- ANT+ plus dual Bluetooth so it can feed a watch, phone app and bike computer at once
- 50 m water resistance with swim mode (clips to goggle strap)
- Standalone recording without a phone; syncs to Polar Flow, Strava and most fitness apps
- Includes armband and swim clip; weighs about 5 g sensor
Category image shown; the store page has photos of this exact product.
