{"product_id":"viiiiva-heart-rate-monitor-v2-175zi","title":"Viiiiva Heart Rate Monitor V2","description":"\u003ch2\u003e4iiii Viiiiva Heart Rate Monitor V2\u003c\/h2\u003e\n\n\u003cp\u003eWith unmatched battery life, rugged water resistance, and dual ANT+ and Bluetooth connectivity, the 4iiii Viiiiva \u003ca href=\"\/accessories\/heart-rate-monitor\"\u003eHeart Rate Monitor\u003c\/a\u003e V2 ensures you never miss a beat - literally.\u003c\/p\u003e\n\n\u003ch3\u003eUnrivalled Accuracy for Smarter Training\u003c\/h3\u003e\n\n\u003cp\u003eThe Viiiiva doesn’t just track your heart rate, it reveals the true story of your effort. By providing real-time, lab-grade data, it helps you fine-tune your training zones, optimise recovery, and push your limits with confidence. For cyclists who rely on data to drive progress, the Viiiiva eliminates guesswork, allowing you to train smarter, not harder. Pair it with a 4iiii power meter to unlock a complete picture of your performance, bridging the gap between watts and heart rate for unparalleled insights into your fitness gains.\u003c\/p\u003e\n\n\u003ch3\u003eBuilt to Endure Your Toughest Rides\u003c\/h3\u003e\n\n\u003cp\u003eAthletes need gear that keeps up with their ambition, and the Viiiiva delivers. With an IPX7 waterproof rating, it shrugs off rain, sweat, and even the occasional mud splash, ensuring reliability in any condition. The 540+ hour battery life, powered by a single CR2032 coin cell, means you can focus on your training, not on charging. Whether you’re logging winter miles or tackling multi-day events, the Viiiiva is engineered to last as long as you do.\u003c\/p\u003e\n\n\u003ch3\u003eSeamless Connectivity for Indoor and Outdoor Training\u003c\/h3\u003e\n\n\u003cp\u003eThe Viiiiva speaks the language of your devices. Thanks to dual ANT+ and Bluetooth compatibility, it syncs effortlessly with your head unit, smartwatch, or favourite indoor training app, from Garmin to Zwift. No more switching monitors or losing data; the Viiiiva ensures your heart rate is always where you need it, whether you’re grinding up a mountain pass or spinning in your pain cave. For cyclists who train across platforms, this versatility is a game-changer.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\n\u003cp\u003eChest Size: 66 - 132cm (26” - 52”)\u003c\/p\u003e\n\n\u003cp\u003eAuto Power Down: 3 minutes\u003c\/p\u003e\n\n\u003cp\u003eTransmission: ANT+ \u0026amp; Bluetooth®\u003c\/p\u003e\n\n\u003cp\u003eBattery Type: CR2032 lithium-ion coin cell\u003c\/p\u003e\n\n\u003cp\u003eBattery Life: 540+ hrs\u003c\/p\u003e\n\n\u003cp\u003eOperating Temperature: 0 - 50°C (32 - 122°F)\u003c\/p\u003e\n\n\u003cp\u003eStorage Temperature: -20 - 70°C (4 - 158°F)\u003c\/p\u003e\n\n\u003cp\u003eData Transmission Range: 3m (9.5’)\u003c\/p\u003e\n\n\u003cp\u003eWaterproof Rating: IPX7\u003c\/p\u003e\n\n\u003cp\u003eHeart Rate Range: 30 - 240 bpm (1 bpm resolution)\u003c\/p\u003e\n\n\u003cp\u003eInput Sensitivity: 5% duty cycle\u003c\/p\u003e\n\n\u003cp\u003eFrequency: 32.768KHz\u003c\/p\u003e\n\n\u003cp\u003eWeight: \u0026lt; 46g (1.6oz)\u003c\/p\u003e","brand":"4iiii","offers":[{"title":"One Size \/ Black","offer_id":54293314371930,"sku":"2013968","price":64.99,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0956\/0827\/5290\/files\/4iiii-Viiiiva-Heart-Rate-Monitor-V2-Black.jpg?v=1781188024","url":"https:\/\/checkout.sigmasports.com\/products\/viiiiva-heart-rate-monitor-v2-175zi","provider":"Sigma Sports","version":"1.0","type":"link"}