Heart Rate Monitor

Trusted by pros and enthusiasts alike, Viiiiva is 10x more sensitive than most heart rate monitors, 5x more responsive, uses advanced beat-to-beat measurement, and can store up to 65 hours of data. The sensor also collects and transfers data from your other ANT+ products via Bluetooth to your iOS or Android device.

Viiiiva is comfortable and easy to wear, featuring a soft, flexible strap for a perfect fit.

Heart Rate Monitor

Replacement Strap


  • Advanced, beat-to-beat measurement makes Viiiiva ten times more sensitive than most heart rate monitors to capture the most sensitive of heart rates, measure heart rate variability, and gauge your level of activity readiness.
  • Activity logging means you can not only view your data in real time, but you can also save up to 65 hours of data on Viiiiva and transfer the data to another device or application.
  • ANT+ sensor bridge lets Viiiiva collect data from other ANT+ sensors, then transfer it via Bluetooth to your iOS or Android smartphone.
  • Tap-to-pair connection lets you simply tap your iOS or Android smartphone to your Viiiiva pod to immediately connect the devices.
  • Fitness equipment pairing enables you to pair Viiiiva with cardio equipment in the gym for real-time and logged data.
  • Display compatibility gives you the freedom to use your choice of ANT+ and Bluetooth compatible displays with Viiiiva.
  • 4iiii product integration means you can use Viiiiva with PRECISION and Sportiiii coaching tools to give you a full range of training data.
  • User-friendly app from 4iiii enables you to see your activity in real time, access upgrades through our web store, and transmit your activity data to other training apps or websites.
  • Viiiiva comes with a replaceable coin cell battery that gives you a great 200 hours of battery life.


  • Weight: 5 g (1.76 oz) 
  • Dimensions: 6.5 cm x 4.5 cm (2.55 in. x 1.77 in.).
  • Strap length: 57–132 cm (23–52 in.).
  • Battery type: CR 2032.
  • Battery life (hours of use): up to 200 hours.
  • Operating temperature: 0–50 C (32–122 F).
  • Waterproof rating: IP 67.
  • Radio frequency: 2.4 GHz.
  • Communications Protocols: ANT+, Bluetooth Smart.


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