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Hasta la vista, chest strap. With the optical OH1 heart rate sensor by Polar, the constricting and uncomfortable chest strap for hobby and endurance athletes is a thing of the past. Get to know the Polar OH1: You'll love it, as you can decide for yourself how to wear the watch-size fitness accessory. Wrapped around your arm with a soft textile strap, the optical sensor reliably and precisely tracks your heart rate for up to 12 hours thanks to six LEDs. According to Polar, the LED sensor is charged with the included USB plug within one hour. Optical heart rate measurement (photoplethysmography) is a reliable and precise measurement technology that offers ambitious hobby athletes sufficient information. The memory saves up to 200 hours of your training data and transfers it via the Polar Flow App with Bluetooth to the web service or compatible bike computers, sports watches and fitness trackers by Polar, such as the Polar V800, M430, M460, M600 and more. Of course, the Polar OH1 heart rate monitor is compatible with numerous fitness apps to transfer your heart rate to iOS or Android smartphones in real time. To read your heart rate directly from the display, you can download the free fitness and training app Polar Beat. Besides, you can create your personal training plan, analyse your performance and share your fitness index. You can even use individual audio guides to improve your fitness level with the Polar Smart Coaching. Besides, you can optionally choose between additional premium functions like fitness tests, energie pointers and efficiency planners.