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Alpha ’s disruptive technology enables continuous monitoring of accurate heart rate and guidance of movement without the need for chest straps or touches. You can wear it on your wrist to measure your heart rate. Even when your speed reaches 20 km / h (12 mph), its accuracy is as accurate as the ECG. American Mio (mio), the world's champion in sales of chestless heart rate monitors, led this epoch-making innovation in 2012! The most advanced super photoelectric sensor technology is used to sense heart rate; no chest strap, no touch, continuous monitoring; heart rate is also accurately measured at a running speed of 20 kilometers per hour; three-color LED display plus a quick review of sound alarm; statistics Running time, heart rate target interval, average heart rate) Compatible with smartphones via Wolf tooth technology, calling functions such as speed, distance, pedometer, global positioning system, etc. through the mobile phone application; time, timer waterproof 30m rechargeable lithium battery watch weight 53g