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Precise heart rate bracelet - Built-in precise optical heart rate sensor that provides continuous and high-precision heart rate data during your workout. Bluetooth and ANT+ connectivity - Thanks to Bluetooth and ANT+ technology, the CooSpo HW706 can be connected to the fitness app on smartphones and tablets, bicycle computers, sports watches and fitness devices. App compatible: This heart rate monitor bracelet works with a variety of fitness apps such as CoospoRide, Wahoo fitness, strava, Nike runclub, Adidas Run app, DDP yoga, elite hrv, peloton app, Rouvy Virtual Cycling and others 20 hours battery life – with the built-in powerful lithium battery, the device offers up to 20 hours of continuous operation on a single charge. Convenient wireless charging via the magnetic charging port. Adjustable straps – CooSpo HW706 comes with 2 adjustable and breathable straps in different sizes (35 cm and 38 cm) for maximum comfort. IP67 waterproof effectively prevents sweat and water from getting into the device during exercise.