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The Billow XSG50 Pro GPS smartwatch is a unique device designed for serious athletes who need to control their training perfectly across various activities such as running, cycling, and mountaineering. Equipped with advanced features including a heart rate monitor, altimeter, barometer, podometer, compass, and calorie counter, you'll have all the data you need at your fingertips. The smartwatch is compatible with both Android and iOS devices and offers a plethora of functions via its free app.