I have this device for the past few months and the quality is goood it monitors the heart rate quickly its ah product of polar group at first site I love the product display and its design it works fine till now its easy to use and its operation is quite simple the water resistant of this device makes it another extra adding feature we get the heart rate within seconds but its cost is ah little bit high but its good u willl not regret for buying this device I recomend to go for the device