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4iiii Viiiiva heart rate monitor with ANT+ and Bluetooth connectivity, 540+ hour battery life and accurate real-time performance tracking.
4iiii Viiiiva heart rate monitor with ANT+ and Bluetooth connectivity, 540+ hour battery life and accurate real-time performance tracking.
4Iiii

4iiii Viiiiva Chest Strap Heart Rate Monitor in Black

£65.00
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With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

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Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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In the unlikely event that you are not satisfied with your purchase please feel free to return your items within 90 days of the purchase date for a full exchange or refund. Any item (excluding food, underwear or e-gift vouchers) can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

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Terms & Conditions

Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

4iiii Viiiiva Chest Strap Heart Rate Monitor in Black

Season:All Year Round

Brand:4Iiii

Code:628308554423

The 4iiii Viiiiva Heart Rate Monitor is designed to deliver precise, real-time insight into your physiological performance, helping you train smarter, recover effectively, and maximise every ride or workout. Whether racing outdoors, climbing virtual mountains on Zwift, or pushing through interval sessions, the Viiiiva provides professional-grade heart rate data with outstanding reliability.

Using a high-sensitivity chest strap, the Viiiiva captures your heart’s electrical activity with exceptional accuracy and transmits data instantly via ANT+ and Bluetooth®. This allows seamless integration with cycling computers, smart trainers, watches, and indoor training platforms, ensuring consistent performance data wherever you train.

Pairing perfectly with a 4iiii power meter, the Viiiiva helps you understand both your external power output and your body’s internal response, giving a complete picture of training intensity, fitness progression, and recovery status.

Designed for all-day comfort and long-term durability, the Viiiiva features an impressive 540+ hour battery life from a single CR2032 battery and an IPX7 waterproof rating to withstand intense training sessions and adverse weather conditions.

Features:
  • Accurate heart rate monitoring: Captures physiological effort with high-sensitivity precision
  • ANT+ & Bluetooth® connectivity: Compatible with head units, smart trainers, and training apps
  • 540+ hour battery life: Long-lasting performance from a single CR2032 battery
  • IPX7 waterproof rating: Built to handle sweat, rain, and demanding training conditions
  • Indoor & outdoor training ready: Ideal for road cycling, indoor training, running, and fitness use
  • Comfort-focused design: Secure and comfortable chest strap for long sessions
  • Perfect power meter pairing: Complements 4iiii power meters for complete training analysis
Specification:
  • Connectivity: ANT+, Bluetooth®
  • Battery type: CR2032 coin cell
  • Battery life: 540+ hours
  • Water resistance: IPX7 (up to 10m)
  • Chest size compatibility: 66–132cm (26–52")
  • Heart rate range: 30–240 BPM
  • Transmission range: 3m (typical)
  • Operating temperature: 0°C to 50°C
  • Storage temperature: -20°C to 70°C
  • Weight: <46g (including battery)
  • Auto power down: After 3 minutes without valid heart rate signal
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