4iiii

4iiii Viiiiva Heart Rate Monitor

£64.99

Real-time heart rate with ANT+ and Bluetooth, a lightweight adjustable strap and 540+ hours of battery life.

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Key Benefits
  • Real-Time Heart Rate — Track your effort throughout rides, runs and indoor training.
  • ANT+ & Bluetooth — Pair with compatible GPS watches, cycle computers and apps.
  • 540+ Hour Battery Life — Replaceable CR2032 coin-cell battery.
  • Secure, Adjustable Fit — Designed for 66–132 cm chest circumferences.
  • IPX7 Water Resistance — Built for wet-weather training.
  • Ultra-Lightweight — Under 46 g, including battery.
  • Power & Heart Rate Together — View your response alongside 4iiii cycling power data.

Train with a clearer picture of your effort. The 4iiii Viiiiva 2.0 is a lightweight chest-strap heart rate monitor that sends real-time heart rate data to compatible GPS watches, cycling computers and training apps. Whether you're riding outdoors, running or training indoors, it helps you understand how your body responds to every session.

Designed for comfortable, everyday training, Viiiiva gives you the feedback you need to manage intensity and pace your efforts. Pair it with a compatible cycling power meter on your training device to see both the work you're producing and how your body is responding.
Technical Specifications
  • Product: 4iiii Viiiiva 2.0 chest-strap heart rate monitor
  • Model: V200
  • Heart rate measurement: 30–240 bpm (1 bpm resolution)
  • Connectivity: ANT+ and Bluetooth Low Energy heart rate
  • Chest circumference: 66–132 cm (26–52 in)
  • Battery: Replaceable CR2032 coin cell
  • Battery life: 540+ hours
  • Weight: Less than 46 g, including battery
  • Water resistance: IPX7
  • Auto power-down: 3 minutes
  • Typical transmission range: 3 m
  • Operating temperature: 0–50°C
  • Storage temperature: –20–70°C
  • Not supported on Viiiiva 2.0: HRV reporting, ANT+ to Bluetooth bridging, onboard workout recording
Suggested Use & Compatibility

How to wear: Adjust the chest strap to fit snugly around your chest, with the sensor positioned centrally below the chest muscles. For the best contact, lightly moisten the strap electrodes before a session.

Compatibility: Pair the Viiiiva 2.0 with compatible ANT+ or Bluetooth heart rate-enabled GPS watches, cycling computers and training apps such as Zwift. Check the receiving device’s sensor specifications and follow its heart rate pairing instructions.

Best for: Cycling, running, indoor training and sessions where reliable, live heart rate feedback helps you manage effort. Heart rate complements power readings from compatible cycling power meters.

Important: Unlike certain earlier Viiiiva versions, the Viiiiva 2.0 does not support ANT+-to-Bluetooth sensor bridging, HRV reporting or onboard activity recording.
Why We Choose 4iiii

We choose 4iiii Viiiiva 2.0 because it makes dependable heart rate tracking straightforward. The combination of dual ANT+ and Bluetooth compatibility, a comfortable adjustable chest strap and more than 540 hours of battery life makes it a practical training essential.

It is especially useful alongside a 4iiii power meter: power tells you the work you are doing, while heart rate shows how your body is responding. Together, those insights help athletes pace sessions and understand their training.

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