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Sweat and waterproof - IP67 waterproof effectively prevents sweat and water from entering the device during exercise. Can be submerged in water up to 1 m deep for up to 30 minutes, but not suitable for swimming. Heart rate zone training: CooSpo HW807 equipped with 5 smart LEDs shows five different heart rate training zones that can help you check real-time heart rate zone through LED colour instead of checking your smartphone. You can adjust your heart rate zones via the Heartool app. Heart rate alarm - Equipped with a vibration motor for notifications. It notifies you as soon as your heart rate exceeds the value you set via the Heartool app. The default maximum heart rate value is 180bpm. Bluetooth and ANT+ connectivity - Thanks to Bluetooth and ANT+ technology, the CooSpo HW807 can be connected to fitness apps on smartphones and tablets, bicycle computers, sports watches and fitness devices. App compatible – This heart rate monitor bracelet works with more than 200 fitness apps such as CoospoRide, Heartool, Wahoo fitness, strava, Nike runclub, Adidas Run app, DDP yoga, Elite HRV, Rouvy Virtual Cycling and others 20 hours battery life - Built-in rechargeable lithium battery with up to 20 hours of continuous operation on a single charge. Charging is easy with the magnetic charging cable. It comes with 2 adjustable and breathable straps in different sizes (35 cm and 38 cm) for maximum comfort. During training, no connection to the app is required, the heart rate data is stored by the bracelet and you can synchronise the data with the Heartool app after training.