Meet the TICKR FIT Optical Heart Rate Armband: a smart wearable device with Bluetooth and ANT+ that helps you track calories burned and heart rate as you push your body. You can pair it with 3rd party fitness apps, smartphones, and watches. The TIKR FIT armband has battery that lasts over 30 hours. It is IPX7 water resistant.
You get two adjustable bands to get started. TICKR FIT is compatible with Apple Watch and Apple TV too. You can use it with TrainerRoad, Strava, Runkeeper, and other popular fitness apps.[where to get it]