Here is a Bluetooth & ANT+ heart rate armband that pairs with your smartphones, watches, and GPS bike computers to help you keep track of your workouts. It has a water-resistant design and offers real-time heart rate and calorie tracking.
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The battery lasts up to 30 hours. Two adjustable bands are include. You can use this armband with Apple Watch and Apple TV. Costs under $80 at this time.
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