1. No chest strap required - superior comfort for your run!
  2. Optical heart-rate sensor that is seamlessly integrated into the hat.
  3. Connect wirelessly to any compatible smartphone, sports watch, or cycling computer via Bluetooth 4.0 and ANT+.
  4. Velcro strap (one size fits all).
  5. All weather compatible and hand washable.
  6. 17 hours of continuous use.
  7. Sound and LED light user interface.