Transform Your Smartphone into a Powerful Bike ComputerTake advantage of the best GPS and biometric display you already own, your smart device. Using Mio VELO you do not need an additional third party cycling computer or mirroring display. This delivers a much richer experience than a cycling computer through superior data representation and enhanced fitness app interaction all on your smart device.- Reads EKG-accurate heart rate data, with no chest strap required- Sends heart rate data to smartphone apps, GPS watches, and bike computers via Bluetooth Smart 4.0 and ANT+- Transmits data from existing ANT+ speed and cadence sensors directly to iOS smartphone apps- 5 configurable heart rate zones allow you to customize your workout- Fits wrist sizes 149-208mm / 5.9"-8.2"- Water resistant up to 30m (3 ATM)Get the Best Workout in Less TimeHeart rate training is proven to help you train more efficiently and effectively, so you can optimize your performance and maximize your workout. Mio VELO offers up to 5 customizable heart rate zones with a 6-colour LED light that tells you which zone you're in at any given moment, so you can stay on track with your training goals.Continuous Technology Built for PerformanceMio Continuous Technology is at the core of each of our products. Our patented design is extremely accurate, with a 0.99 correlation to EKG in laboratory testing. LED lights and an electro-optical cell monitor the volume of blood under your skin and sophisticated algorithms are applied to the pulse signal so that the heart's true rhythm can be detected—even at high-performance speeds.Wireless ConnectivityVELO transmits your heart rate data to Mio GO and other popular cycling apps, like Strava, Wahoo, Cyclemeter, Endomondo, MapMyRide, and more via Bluetooth (4.0) and ANT+ to any compatible smartphone, sports watch, bike computer, or other fitness device. VELO also converts ANT+ speed and cadence sensors into Bluetooth Smart 4.0, so you can sync your heart rate, speed, and cadence data with select iOS cycling apps.Comfort. Form. Function.Mio VELO delivers maximum performance in ultimate comfort. Its soft, durable silicone strap ensures a snug and comfortable fit – and with no need for a chest strap, you'll be more comfortable than ever. Heart rate training has never been more convenient and easy.Specs- Material : Soft silicone- Battery : Rechargeable li-poly battery with USB charger- Battery Life : Up to 8 hours- Water Resistant : 30m (3 ATM)- Dimensions : 265 x 440 x 300 mm (lxwxh)- Weight : 33.7g- Sensors :Optical heart rate- Sync method : Bluetooth Smart (4.0) and ANT+- Measures : EKG-accurate heart rate